C
SECTION C — CHEMISTRY AND METALLURGY
  
CHEMISTRY
 C07
ORGANIC CHEMISTRY (such compounds as the oxides, sulphides, and oxysulphides of carbon, cyanogen, phosgene, hydrocyanic acid and salts thereof C01; macromolecular compounds C08; dyes C09; fermentation products C12)
 C07

Note(s)

  1. Salts of a compound, unless specifically provided for, are classified as that compound, e.g. aniline hydrochloride is classified as containing carbon, hydrogen and nitrogen only (in C07C 87/52), sodium oxalate is classified as oxalic acid (in C07C 55/06), and a mercaptide is classified as the mercaptan. Metal chelates are dealt with in the same way. Similarly, metal alcoholates and metal phenates are classified in C07C and not in C07F— the alcoholates in C07C 31/28-C07C 31/32 and the phenates as the corresponding phenols in C07C 39/00.
  2. In the absence of an indication to the contrary, and with the exception referred to below, a compound is always classified in the last appropriate place in the classification system, e.g. a compound containing an acyclic chain and a heterocyclic ring is classified only as a heterocyclic compound, and a sterol is classified only as a cyclopentanophenanthrene compound. In general, and in the absence of an indication to the contrary (such as groups C07C 59/24, C07C 59/26), the terms "acyclic" and "aliphatic" are used to describe compounds in which there is no ring; and, if a ring were present, the compound would be taken by the "last place" rule to a later group for cycloaliphatic or aromatic compounds, if such a group exists. Where a compound or an entire group of compounds exists in tautomeric forms, it is classified as though existing in the form which is classified last in the system, unless the other form is specifically mentioned earlier in the system.
  3. Albumens, proteins, alkaloids of unknown structure, glucosides of unknown structure are examples of compounds to be found unter C07G.
  4. Inventions dealing with the preparation of chemical compounds might be classified both according to the type of reaction employed and according to the type of compound prepared, if suitable groups or sub-groups exits.
 C07D
HETEROCYCLIC COMPOUNDS (peptides containing heterocyclic groups C07C 103/52)
 C07D

Note(s)

In the absence of an indication to the contrary (such as the mention of isatoic anhydride in C07D 87/10), the cyclic anhydride of a polycarboxylic acid is classified with the acid in C07C.

In this sub-class

 C07D 1/00 - 
C07D 21/00
Heterocyclic compounds having oxygen alone as the hetero atom or atoms (sugars C07C 47/00, C07C 49/00 and C13; cyclopentanopolyhydrophenanthrenes containing one or more heterocyclic rings C07C 173/00)
 C07D 1/00
Heterocyclic compounds containing one or more rings each consisting of 1 oxygen atom and 2 carbon atoms
 C07D 1/02
·  Preparation of epoxy compounds
 C07D 1/04
·  ·  from a-alkylene halohydrins
 C07D 1/06
·  ·  by oxidising unsaturated compounds
 C07D 1/08
·  ·  ·  by oxidising olefins
 C07D 1/10
·  ·  ·  by oxidising gats, fatty oils, or their fatty acids
 C07D 1/12
·  ·  a-alkylene oxides
 C07D 1/14
·  ·  Ethylene oxide
 C07D 1/16
·  Epihalohydrins
 C07D 1/18
·  Epoxy alcohols; Their ethers or esters
 C07D 1/20
·  Epoxy acids
 C07D 1/22
·  ·  Esters thereof
 C07D 1/24
·  ·  Nitriles thereof
 C07D 3/00
Heterocyclic compounds containing one or more rings each consisting of 1 oxygen atom and 3 carbon atoms
 C07D 5/00
Heterocyclic compounds containing one or more rings each consisting of 1 oxygen atom and 4 carbon atoms
 C07D 5/02
·  Tetrahydrofurans
 C07D 5/04
·  ·  Substituted tetrahydrofurans
 C07D 5/06
·  ·  gamma-lactones
 C07D 5/08
·  Dihydrofurans
 C07D 5/10
·  ·  Substituted dihydrofurans
 C07D 5/12
·  ·  ·  Ascorbic acid
 C07D 5/14
·  Furans
 C07D 5/16
·  ·  Substituted furans
 C07D 5/18
·  ·  ·  having halogen directly attached to the ring
 C07D 5/20
·  ·  ·  Furfuryl alcohol
 C07D 5/22
·  ·  ·  Furfural
 C07D 5/24
·  ·  ·  ·  Preparation from natural products
 C07D 5/26
·  ·  ·  having one or more carboxyl groups directly attached to the ring
 C07D 5/28
·  ·  ·  ·  Pyromucic acid
 C07D 5/30
·  ·  ·  having one or more nitro groups directly attached to the ring
 C07D 5/32
·  Polycyclic compounds
 C07D 5/34
·  ·  Condensed dihydrofurans
 C07D 5/36
·  ·  ·  Coumarans
 C07D 5/38
·  ·  ·  Phthaleins
 C07D 5/40
·  ·  Condensed furns
 C07D 5/42
·  ·  ·  Coumarones
 C07D 5/44
·  ·  ·  Dibenzofurans (diphenylene oxides)
 C07D 5/46
·  ·  Compounds containing more than one furan ring
 C07D 7/00
Heterocyclic compounds containing one or more rings each consisting of 1 oxygen atom and 5 carbon atoms
 C07D 7/02
·  Tetrahydropyrans
 C07D 7/04
·  ·  Substituted tetrahydropyrans
 C07D 7/06
·  ·  ·  -lactones
 C07D 7/08
·  Dihydropyrans
 C07D 7/10
·  ·  Substituted dihydropyrans
 C07D 7/12
·  Pyrans
 C07D 7/14
·  ·  Substituted pyrans
 C07D 7/16
·  ·  ·  Pyrones
 C07D 7/18
·  Polycyclic compounds
 C07D 7/20
·  ·  Condensed dihydropyrans
 C07D 7/22
·  ·  ·  Tocopherols
 C07D 7/24
·  ·  Condensed pyrans
 C07D 7/26
·  ·  ·  1,2[H]-Benzopyrans
 C07D 7/28
·  ·  ·  ·  Coumarin
 C07D 7/30
·  ·  ·  ·  ·  4-hydroxy-coumarins
 C07D 7/32
·  ·  ·  1,4[H]-Benzopyrans
 C07D 7/34
·  ·  ·  ·  gamma-chromones
 C07D 7/36
·  ·  ·  ·  ·  Furanochromones
 C07D 7/38
·  ·  ·  ·  ·  Rutin
 C07D 7/40
·  ·  ·  Isochromenes
 C07D 7/42
·  ·  ·  Xanthenes
 C07D 7/44
·  ·  ·  ·  Xanthones
 C07D 7/46
·  ·  Compounds containing more than one pyran ring
 C07D 9/00
Heterocyclic compounds containing one ore more rings each consisting of 1 oxygen atom and more than 5 carbon atoms
 C07D 11/00
Heterocyclic compounds containing one ore more rings each having the same structure and each consisting of 2 oxygen atoms and 1 or 2 carbon atoms
 C07D 13/00
Heterocyclic compounds containing one ore more rings each having the same structure and each consisting of 2 oxygen atoms and 3 carbon atoms
 C07D 13/02
·  1,3-dioxolanes
 C07D 13/04
·  ·  Substituted dioxolanes
 C07D 13/06
·  ·  ·  Glycol carbonate
 C07D 13/08
·  1,3-dioxoles
 C07D 13/10
·  ·  1,3-benzo-dioxoles (methylenedioxybenzenes)
 C07D 15/00
Heterocyclic compounds containing one ore more rings each having the same structure and each consisting of 2 oxygen atoms and 4 carbon atoms
 C07D 15/02
·  1,3-dioxanes
 C07D 15/04
·  ·  Substituted 1,3-dioxanes
 C07D 15/06
·  ·  ·  having halogen directly attached to the ring
 C07D 15/08
·  ·  1,3-benzodioxanes
 C07D 15/10
·  1,4-dioxanes
 C07D 15/12
·  ·  Substituted, 1,4-dioxanes
 C07D 15/14
·  ·  ·  having halogen directly attached to the ring
 C07D 15/16
·  ·  ·  Lactides
 C07D 15/18
·  ·  2,3-benzo-1,4-dioxanes
 C07D 15/20
·  ·  Diphenylene dioxides
 C07D 17/00
Heterocyclic compounds containing one ore more rings each having the same structure and each consisting of 2 oxygen atoms and more than 4 carbon atoms
 C07D 19/00
Heterocyclic compounds containing one ore more rings each having the same structure and each consisting of more than 2 oxygen atoms and some carbon atoms
 C07D 21/00
Heterocyclic compounds containing rings each of which has oxygen as the only hetero element, the rings differing one from another either in structure or composition or both (furanochromones C07D 7/36)
 C07D 23/00 - 
C07D 57/00
Heterocyclic compounds having nitrogen alone as the hetero atom or atoms
 C07D 23/00 - 
C07D 57/00

Note(s)

Unless specifically provided for, as in group C07D 31/22, a quaternary derivative of a heterocyclic N-compound is classified as that compound.

 C07D 23/00
Heterocyclic compounds containing one or more rings each consisting of 1 nitrogen atom and 2 carbon atoms
 C07D 23/02
·  a-alkylenimines
 C07D 23/04
·  ·  Ethylenimine
 C07D 23/06
·  ·  N-substituted ethylenimines
 C07D 23/08
·  ·  ·  N, N-ethylene ureas; N,N-ethylene guanidines
 C07D 25/00
Heterocyclic compounds containing one or more rings each consisting of 1 nitrogen atom and 3 carbon atoms
 C07D 25/02
·  -lactams
 C07D 27/00
Heterocyclic compounds containing one or more rings each consisting of 1 nitrogen atom and 4 carbon atoms
 C07D 27/02
·  Tetrahydropyrroles (pyrrolidines)
 C07D 27/04
·  ·  Substituted tetrahydropyrroles
 C07D 27/06
·  ·  ·  Oxo-tetrahydropyrroles
 C07D 27/08
·  ·  ·  ·  2-Pyrrolidones (gamma-lactams)
 C07D 27/10
·  ·  ·  ·  Succinimides
 C07D 27/12
·  Dihydropyrroles (pyrrolines)
 C07D 27/14
·  ·  Substituted dihydropyrroles
 C07D 27/16
·  ·  ·  Oxo-dihydropyrroles
 C07D 27/18
·  ·  ·  ·  Maleimimide
 C07D 27/20
·  Pyrroles
 C07D 27/22
·  ·  C-substituted pyrolles
 C07D 27/24
·  ·  N-substituted pyrroles
 C07D 27/26
·  ·  C- and N-substituted pyrroles
 C07D 27/28
·  Polycyclic compounds
 C07D 27/30
·  ·  Condensed tetrahydropyrroles
 C07D 27/32
·  ·  ·  Dihydroindolines
 C07D 27/34
·  ·  ·  Adrenochrome
 C07D 27/36
·  ·  Condensed dihydropyrroles
 C07D 27/38
·  ·  ·  Indolines
 C07D 27/40
·  ·  ·  ·  Indolinones
 C07D 27/42
·  ·  ·  ·  ·  Isatin
 C07D 27/44
·  ·  ·  Benz-(c,d)-indolines
 C07D 27/46
·  ·  ·  ·  Naphthostyrils
 C07D 27/48
·  ·  ·  Isoindolines
 C07D 27/50
·  ·  ·  ·  Isoindolinones (phthelimidines)
 C07D 27/52
·  ·  ·  ·  ·  Phthalimides
 C07D 27/54
·  ·  Condensed pyrroles
 C07D 27/56
·  ·  ·  Indoles; Indolenines
 C07D 27/58
·  ·  ·  ·  Preparation of indole from coal-tar
 C07D 27/60
·  ·  ·  ·  Tryptophane
 C07D 27/62
·  ·  ·  ·  Tryptamine
 C07D 27/64
·  ·  ·  Carbazoles
 C07D 27/66
·  ·  ·  ·  Purification
 C07D 27/68
·  ·  ·  ·  Substituted carbazoles
 C07D 27/70
·  ·  ·  Benz-indoles
 C07D 27/72
·  ·  ·  ·  Benz-(c,d)-indoles
 C07D 27/74
·  ·  Compounds containing more than one ring each consisting of 1 nitrogen atom and 4 carbon atoms
 C07D 27/76
·  ·  ·  Bilirubins; Porphyrins; Hemin; Chlorophyll
 C07D 27/78
·  ·  ·  Pyrroly-pyrroles
 C07D 27/80
·  ·  ·  ·  hydrogenated
 C07D 29/00
Heterocyclic compounds containing one or more hydrogenated pyridine rings none of which is condensed with any other rings
 C07D 29/02
·  Hexahydropyridines (piperidines)
 C07D 29/04
·  ·  Preparation by ring closure
 C07D 29/06
·  ·  Preparation by hydrogenation
 C07D 29/08
·  ·  Piperidine and its C-homologues
 C07D 29/10
·  ·  Piperidines N-substituted by hydrocarbon groups
 C07D 29/12
·  ·  Other piperidine derivatives which are substituted in the ring and/or outside the ring
 C07D 29/14
·  ·  ·  by one or more halogen atoms
 C07D 29/16
·  ·  ·  by one or more hydroxyl groups
 C07D 29/18
·  ·  ·  ·  Ethers thereof
 C07D 29/20
·  ·  ·  by one or more oxo groups
 C07D 29/22
·  ·  ·  ·  2-piperidones (-lactams)
 C07D 29/24
·  ·  ·  by one or more carboxyl groups, carboxylic acid ester groups, or carboxylic acid halide groups
 C07D 29/26
·  ·  ·  by one or more nitrogen-containing groups
 C07D 29/28
·  ·  ·  ·  by one or more amino groups
 C07D 29/30
·  ·  ·  ·  by one or more carboxylic acid amide groups
 C07D 29/32
·  ·  ·  ·  by one or more cyano groups
 C07D 29/34
·  ·  ·  by one or more sulphur-containing groups
 C07D 29/36
·  ·  ·  ·  by one or more mercapto, thiother, or =S groups
 C07D 29/38
·  Tetrahydropyridines
 C07D 29/40
·  Dihydropyridines
 C07D 29/42
·  ·  Pyridones
 C07D 31/00
Heterocyclic compounds containing one or more pyridine rings none of which is condensed with any other ring
 C07D 31/02
·  Methods of preparation
 C07D 31/04
·  ·  by ring closure
 C07D 31/06
·  ·  ·  from unsaturated aliphatic compounds and ammonia
 C07D 31/08
·  ·  ·  from oxo compounds an ammonia
 C07D 31/10
·  ·  ·  from heterocyclic compounds having oxygen as the hetero atom and ammonia
 C07D 31/12
·  ·  by dealkylation of alkyl pyridines
 C07D 31/14
·  ·  by dehydrogenation of piperideines or other hydrogenated pyridines
 C07D 31/16
·  Separation; Purification
 C07D 31/18
·  ·  from coal-tar and the like
 C07D 31/20
·  Pyridine; Pyridines substituted by one or more hydrocarbon groups
 C07D 31/22
·  ·  Quaternary compounds thereof
 C07D 31/24
·  Other pyridine derivatives which are substituted in the ring and/or outside the ring
 C07D 31/26
·  ·  by one or more halogen atoms
 C07D 31/28
·  ·  by one or more hydroxyl groups and/or etherified hydroxyl groups
 C07D 31/30
·  ·  ·  directly attached to the ring
 C07D 31/32
·  ·  by one or more oxo groups
 C07D 31/34
·  ·  by one or more carboxyl groups, carboxylic acid ester groups, or carboxylic acid halide groups
 C07D 31/36
·  ·  ·  directly attached to the ring
 C07D 31/38
·  ·  ·  ·  Preparation of pyridine carboxylic acids by oxydisig pyridines or condensed pyridines
 C07D 31/40
·  ·  by one or more nitrogen containing groups
 C07D 31/42
·  ·  ·  by one or more amino groups
 C07D 31/44
·  ·  ·  by open or more carboxylic acid amide groups
 C07D 31/46
·  ·  ·  by one or more cyano groups
 C07D 31/48
·  ·  by one or more sulphur-containing groups
 C07D 31/50
·  ·  ·  by one or more mercapto, thioether, or =S groups
 C07D 33/00
Heterocyclic compounds containing one or more rings of the quinoline type
 C07D 33/02
·  Decahydroquinolines
 C07D 33/04
·  ·  Preparation by hydrogenation of quinolines
 C07D 33/06
·  Octahydroquinolines
 C07D 33/08
·  Hexahydroquinolines
 C07D 33/10
·  Tetrahydroquinolines
 C07D 33/12
·  Dihyroquinolines
 C07D 33/14
·  Quinolines
 C07D 33/16
·  ·  Methods of preparation
 C07D 33/18
·  ·  ·  by ring closure
 C07D 33/20
·  ·  ·  ·  from aromatic amines and glycerol or oxo compounds
 C07D 33/22
·  ·  ·  ·  from o-amino-benzaldehyde and oxo compounds
 C07D 33/24
·  ·  ·  by dehydrogenation of hydrogenated quinolines
 C07D 33/26
·  ·  Separation; Purification
 C07D 33/28
·  ·  ·  from coal-tar and the like
 C07D 33/30
·  ·  Quinoline; Quinolines substituted by one or more hydrocarbon groups
 C07D 33/32
·  ·  ·  Quaternary compounds thereof
 C07D 33/34
·  ·  Other quinoline derivatives which are substituted in the ring and/or outside the ring
 C07D 33/36
·  ·  ·  by one or more halogen atoms
 C07D 33/38
·  ·  ·  by one or more hydroxyl groups and/or etherified hydroxyl groups
 C07D 33/40
·  ·  ·  ·  directly attached to the hetero ring
 C07D 33/42
·  ·  ·  ·  ·  2-hydroxy quinolines
 C07D 33/44
·  ·  ·  ·  8-hydroxy quinolines
 C07D 33/46
·  ·  ·  by one or more oxo groups
 C07D 33/48
·  ·  ·  by one or more carboxyl groups, carboxylic acid ester groups, or carboxylic acid halide groups
 C07D 33/50
·  ·  ·  by one or more nitrogen-containing groups
 C07D 33/52
·  ·  ·  ·  by one or more amino groups
 C07D 33/54
·  ·  ·  ·  ·  Amono alkylaminoquinolines
 C07D 33/56
·  ·  ·  ·  by one or more carboxylic acid amide groups
 C07D 33/58
·  ·  ·  ·  by one or more cyano groups
 C07D 33/60
·  ·  ·  by one ore more sulphur-containing groups
 C07D 33/62
·  ·  ·  ·  by one or more mercapto, thioether, or =S groups
 C07D 35/00
Heterocyclic compounds containing one or more rings of the isoquinoline type
 C07D 35/02
·  Decahydroisoquinolines
 C07D 35/04
·  ·  Preparation by hydrogenation of isoquinolines
 C07D 35/06
·  Octahydroisoquinolines
 C07D 35/08
·  Hexahydroisoquinolines
 C07D 35/10
·  Tetrahydroisoquinolines
 C07D 35/12
·  ·  Preparation from phenyl-ethyl amines and aldehydes
 C07D 35/14
·  Dihydroisoquinolines
 C07D 35/16
·  ·  Preparation from acylated -phenol-ethyl amines
 C07D 35/18
·  Isoquinolines
 C07D 35/20
·  ·  Preparation by ring closure
 C07D 35/22
·  ·  Isoquinoline; Isoquinolines substituted by one or more hydrocarbon groups
 C07D 35/24
·  ·  Other isoquinoline derivatives which are substituted in the ring and/or outside the ring
 C07D 35/26
·  ·  ·  by one or more halogen atoms
 C07D 35/28
·  ·  ·  by one or more hydroxyl groups and/or etherified hydroxyl groups, e.g. papaverine
 C07D 35/30
·  ·  ·  by one or more oxo groups
 C07D 35/32
·  ·  ·  by one or more carboxyl groups, carboxylic acid ester groups, or carboxylic acid halide groups
 C07D 35/34
·  ·  ·  by one or more nitrogen-containing groups
 C07D 35/36
·  ·  ·  ·  by one or more amino groups
 C07D 35/38
·  ·  ·  ·  by one or more carboxylic acid amide groups
 C07D 35/40
·  ·  ·  ·  by one or more cyano groups
 C07D 35/42
·  ·  ·  by one or more sulphur-containing groups
 C07D 35/44
·  ·  ·  ·  by one or more mercapto, thioether, or =S groups
 C07D 37/00
Heterocyclic compounds containing one or more rings of the acridine type
 C07D 37/02
·  Hydrogenated acridines
 C07D 37/04
·  ·  not completely hydrogenated
 C07D 37/06
·  ·  ·  Acridans
 C07D 37/08
·  Acridines
 C07D 37/10
·  ·  Acridine; Acridines substituted by one or more hydrocarbon groups
 C07D 37/12
·  ·  Other acridine derivatives which are substituted in the ring and/or outside the ring
 C07D 37/14
·  ·  ·  by one or more halogen atoms
 C07D 37/16
·  ·  ·  by one or more hydroxyl groups and/or etherified hydroxyl groups
 C07D 37/18
·  ·  ·  by one or more oxo groups
 C07D 37/20
·  ·  ·  by one or more carboxyl groups, carboxylic acid ester groups, or carboxylic acid halide groups
 C07D 37/22
·  ·  ·  by one or more nitrogen-containing groups
 C07D 37/24
·  ·  ·  ·  by one or more amino groups
 C07D 37/26
·  ·  ·  ·  by one or more carboxylic acid amide groups
 C07D 37/28
·  ·  ·  ·  by one or more cyano groups
 C07D 37/30
·  ·  ·  by one or more sulphur-containing groups
 C07D 39/00
Other heterocyclic compounds containing one or more pyridine or hydrogenated pyridine rings at least one of which is condensed with one or more rings of the same type and/or with carbocyclic rings
 C07D 39/02
·  Phenanthridines
 C07D 39/04
·  ·  Recovery from coal-tar
 C07D 39/06
·  Quinuclidines
 C07D 39/08
·  Nor-camphidines; Camphidines
 C07D 39/10
·  Naphtyridines
 C07D 39/12
·  Quinolizines
 C07D 39/14
·  Phenanthrolines
 C07D 39/16
·  1,8-naphthalimides
 C07D 41/00
Heterocyclic compounds containing one or more rings each consisting of 1 nitrogen atom and more than 5 carbon atoms
 C07D 41/02
·  Hexamethylenimines
 C07D 41/04
·  ·  Substituted hexamethylenimines
 C07D 41/06
·  ·  ·  epsilon-lactams
 C07D 41/08
·  Azepines
 C07D 43/00
Heterocyclic compounds containing the ring system of an alkaloid type specified below (substituted purines C07D 57/38)
 C07D 43/02
·  containing the ring system of nicotine
 C07D 43/04
·  ·  Obtaining from natural raw materials
 C07D 43/06
·  containing the ring system of tropa alkaloids
 C07D 43/08
·  ·  Obtaining from extracts of natural raw materials
 C07D 43/10
·  ·  Atropine
 C07D 43/12
·  ·  Tropine
 C07D 43/14
·  ·  Cocaine
 C07D 43/16
·  ·  Scopoline
 C07D 43/18
·  Granatanines
 C07D 43/20
·  containing the ring system of ergot alkaloids
 C07D 43/22
·  ·  Obtaining from extracts of natural raw materials
 C07D 43/24
·  containing the ring system of cinchona alkaloids
 C07D 43/26
·  ·  Obtaining from extracts of natural raw materials
 C07D 43/28
·  containing the ring system of opium alkaloids (papaverine and its derivatives C07D 35/28)
 C07D 43/30
·  ·  Obtaining from extract of natural raw materials
 C07D 43/32
·  ·  Morphine
 C07D 43/34
·  containing the ring system of strychnine
 C07D 43/36
·  ·  Obtaining from extracts of natural raw materials
 C07D 43/38
·  containing the ring system of iboga alkaloids
 C07D 45/00
Heterocyclic compounds containing one or more rings each consisting of 2 nitrogen atoms and 1 carbon atom (diazo compounds C07C 113/00)
 C07D 47/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 2 nitrogen atoms and 2 carbon atoms
 C07D 49/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 2 nitrogen atoms and 3 carbon atoms
 C07D 49/02
·  containing one or more 1,2-diazole or hydrogenated 1,2-diazole rings
 C07D 49/04
·  ·  Pyrazolidones; Substituted pyrazolidones
 C07D 49/06
·  ·  ·  Amino-pyrazolidones with amine group(s) directly attached to the ring
 C07D 49/08
·  ·  ·  Dioxopyrazolidines
 C07D 49/10
·  ·  Pyrazolines; Substituted pyrazolines
 C07D 49/12
·  ·  ·  Amino-pyrazolines with amine group(s)
 C07D 49/14
·  ·  ·  Pyrazolones; Substituted pyrazolones
 C07D 49/16
·  ·  ·  ·  Amino-pyrazolones with amine group(s) directly attached to the ring
 C07D 49/18
·  ·  Pyrazoles; Substituted pyrazoles
 C07D 49/20
·  ·  ·  Amino-pyrazoles with amine group(s) directly attached to the ring
 C07D 49/22
·  ·  ·  ·  Benzene sulphonylamido pyrazoles
 C07D 49/24
·  ·  ·  Pyrazoloanthrones
 C07D 49/26
·  ·  Pyrazolo-pyrazoles
 C07D 49/28
·  ·  ·  hydrogenated
 C07D 49/30
·  containing one or more 1,3-diazole or hydrogenated 1,3-diazole rings
 C07D 49/32
·  ·  Hydantoins
 C07D 49/34
·  ·  Imidazolines
 C07D 49/36
·  ·  Imidazoles
 C07D 49/38
·  ·  ·  Benzimidazoles
 C07D 49/40
·  ·  ·  Naphthimidazoles
 C07D 49/42
·  ·  Imidazolo-imidazoles
 C07D 49/44
·  ·  ·  hydrogenated
 C07D 51/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 2 nitrogen atoms and 4 carbon atoms
 C07D 51/02
·  containing one or more 1,2-diazine or hydrogenated 1,2-diazine rings
 C07D 51/04
·  ·  Pyridazines
 C07D 51/06
·  ·  Phthalazines
 C07D 51/08
·  ·  Cinnolines
 C07D 51/10
·  ·  ·  Benzo-cinnolines
 C07D 51/12
·  ·  Pyridazo-pyridazines
 C07D 51/14
·  ·  ·  hydrogenated
 C07D 51/16
·  containing one or more 1,3-diazine or hydrogenated 1,3-diazine rings
 C07D 51/18
·  ·  Hexahydropyrimidines
 C07D 51/20
·  ·  ·  Barbituric acids; Inorganic salts thereof
 C07D 51/22
·  ·  ·  ·  Salts of organic bases; Organic double compounds
 C07D 51/24
·  ·  ·  Thiobarbituric acids; Inorganic salts thereof
 C07D 51/26
·  ·  ·  ·  Salts of organic bases; Organic double compounds
 C07D 51/28
·  ·  Tetrahydropyrimidines
 C07D 51/30
·  ·  ·  Uracils
 C07D 51/32
·  ·  ·  Thiracils
 C07D 51/34
·  ·  Dihydropyrimidines
 C07D 51/36
·  ·  Pyrimidines
 C07D 51/38
·  ·  ·  having one or more hydroxyl groups directly attached to the ring
 C07D 51/40
·  ·  ·  having one or more mercapto groups directly attached to the ring
 C07D 51/42
·  ·  ·  having one or more amine groups directly attached to the ring
 C07D 51/44
·  ·  ·  ·  Amino benzene sulphonylamido pyrimidines (sulphapyrimidines)
 C07D 51/46
·  ·  condensed
 C07D 51/48
·  ·  ·  Quinazolines
 C07D 51/50
·  ·  Nucleosides; Nucleotides; Nucleic acids
 C07D 51/52
·  ·  ·  with pyrimidine bases
 C07D 51/54
·  ·  ·  with purine bases
 C07D 51/56
·  ·  Pyrimido pyrimidines; Hydrogenated pyrimido pyrimidines
 C07D 51/58
·  ·  ·  Pyrimido [4,5-d] pyrimidines
 C07D 51/60
·  ·  ·  Pyrimido [5,4-d] pyrimidines
 C07D 51/62
·  containing one or more 1,4-diazine or hydrogenated 1,4-diazine rings
 C07D 51/64
·  ·  Hexahydropyrazines (piperazines)
 C07D 51/66
·  ·  ·  C-substituted piperazines
 C07D 51/68
·  ·  ·  ·  Oxopiperazines; C-substituted oxo-piperazines
 C07D 51/70
·  ·  ·  N-substituted piperazines
 C07D 51/72
·  ·  ·  C- and N-substituted piperazines
 C07D 51/74
·  ·  Tetrahydropyrazines; Dihydropyrazines; Derivatives thereof, e.g. aspergillic acid
 C07D 51/76
·  ·  Pyrazine; Derivatives thereof
 C07D 51/78
·  ·  Quinoxalines; Hydrogenated quinoxalines
 C07D 51/80
·  ·  Phenazines
 C07D 51/82
·  ·  Pyrazo pyrazines; Hydrogenated pyrazo pyrazines
 C07D 51/84
·  ·  1,4-diazabicyclo [2,2,2] octanes
 C07D 53/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 2 nitrogen atoms and more than 4 carbon atoms
 C07D 53/02
·  Diazepines
 C07D 53/04
·  Benzodiazepines
 C07D 53/06
·  ·  1,4-benzodiazepines
 C07D 55/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of more than 2 nitrogen atoms and 1 or more carbon atoms
 C07D 55/02
·  containing one or more 1,2,3-triazole or hydrogenated 1,2,3-triazole rings
 C07D 55/04
·  ·  Benzo-1,2,3,-triazoles; Naphtho-1,2,3-triazoles
 C07D 55/06
·  containing one or more 1,2,4-triazole or hydrogenated 1,2,4-triazole rings
 C07D 55/08
·  containing one or more 1,2,3-triazine or hydrogenated 1,2,3-triazine rings
 C07D 55/10
·  containing one or more 1,2,4-triazine or hydrogenated 1,2,4-triazine rings
 C07D 55/12
·  containing one or more 1,3,5-triazine or hydrogenated 1,3,5-triazine rings
 C07D 55/14
·  ·  hydrogenated
 C07D 55/16
·  ·  ·  1,3,5-trinitro-hexahydro-triazine
 C07D 55/18
·  ·  Monoamino-1,3,5-triazines
 C07D 55/20
·  ·  Diamino-1,3,5-triazines
 C07D 55/22
·  ·  Triamino-1,3,5-triazines
 C07D 55/24
·  ·  ·  Melamine; Purification thereof; N-Derivatives thereof
 C07D 55/26
·  ·  ·  ·  Preparation of melamine from calcium cyanamide, cyanamide or dicyandiamide
 C07D 55/28
·  ·  ·  ·  Preparation of melamine from urea or carbondioxide and ammonia
 C07D 55/30
·  ·  ·  ·  Preparation of melamine from other materials
 C07D 55/32
·  ·  ·  ·  Alkylol melamines; Etherified alkylol melamines
 C07D 55/34
·  ·  Mono- and di-hydroxy-1,3,5-triazines
 C07D 55/36
·  ·  Cyanuric acid; Derivatives thereof (melamine C07D 55/24)
 C07D 55/38
·  ·  ·  Isocyanurates
 C07D 55/40
·  ·  ·  Chloro isocyanuric acids
 C07D 55/42
·  ·  ·  Cyanuric halides
 C07D 55/44
·  ·  Amino-hydroxy-1,3,5-triazines
 C07D 55/46
·  ·  Amino-halogeno-1,3,5-triazines
 C07D 55/48
·  ·  Mono- and di-halogeno-1,3,5-triazines
 C07D 55/50
·  ·  1,3,5-triazines substituted by groups not mentioned in C07D 55/16-C07D 55/48
 C07D 55/52
·  ·  Hexamethylenetetramine
 C07D 55/54
·  containing one or more rings consisting of 3 nitrogen atoms and more than 3 carbon atoms
 C07D 55/56
·  containing one or more rings consisting of 4 nitrogen atoms and 1 carbon atoms
 C07D 55/58
·  containing one or more rings consisting of 4 nitrogen atoms and 2 carbon atoms
 C07D 55/60
·  containing one or more rings consisting of 4 nitrogen atoms and more than 2 carbon atoms
 C07D 55/62
·  ·  Coorinoids (Vitamin B12)
 C07D 55/64
·  containing one or more rings consisting of more than 4 nitrogen atoms and 1 or more carbon atoms (cyclic peptides C07C 103/52)
 C07D 57/00
Heterocyclic compounds containing rings each of which has nitrogen as the only hetero element the rings differing one from another either in structure or composition or both
 C07D 57/02
·  in which the different hetero rings are condensed together
 C07D 57/04
·  ·  containing one or more pyridine rings
 C07D 57/06
·  ·  ·  Carbolines
 C07D 57/08
·  ·  ·  ·  Rauwolfia alkaloids
 C07D 57/10
·  ·  ·  ·  ·  containing the ring system of yohimbane
 C07D 57/12
·  ·  containing one or more pyrimidine rings (purines C07D 57/36)
 C07D 57/14
·  ·  ·  pyrrolo-pyrimidines
 C07D 57/16
·  ·  ·  pyrazolo-pyrimidines
 C07D 57/18
·  ·  ·  triazolo-pyrimidines
 C07D 57/20
·  ·  ·  pyrido-pyrimidines
 C07D 57/22
·  ·  containing one or more pyridazine rings
 C07D 57/24
·  ·  containing one or more pyrazine rings
 C07D 57/26
·  ·  ·  1,1'-ethylene-2,2'-dipyridylium salts
 C07D 57/28
·  ·  ·  Pterines
 C07D 57/30
·  ·  ·  ·  Folic acid
 C07D 57/32
·  ·  ·  Flavines
 C07D 57/34
·  ·  containing one or more tirazine rings
 C07D 57/36
·  ·  Purines
 C07D 57/38
·  ·  ·  Substituted purines
 C07D 57/40
·  ·  ·  ·  Xanthines
 C07D 57/42
·  ·  ·  ·  ·  Theobromine
 C07D 57/44
·  ·  ·  ·  ·  ·  Obtaining from extracts of natural raw materials
 C07D 57/46
·  ·  ·  ·  ·  ·  Salts or double compounds thereof
 C07D 57/48
·  ·  ·  ·  ·  Theophylline
 C07D 57/50
·  ·  ·  ·  ·  ·  Obtaining from extracts of natural raw materials
 C07D 57/52
·  ·  ·  ·  ·  ·  Salts or double compounds thereof
 C07D 57/54
·  ·  ·  ·  ·  Caffeine
 C07D 57/56
·  ·  ·  ·  ·  ·  Obtaining from extracts of natural raw materials
 C07D 57/58
·  ·  ·  ·  ·  ·  Salts or double compounds thereof
 C07D 57/60
·  ·  ·  ·  having two hydroxyl groups both directly attached to the ring system
 C07D 57/62
·  ·  ·  ·  having one or more mercapto groups directly attached to the ring system
 C07D 57/64
·  ·  ·  ·  having one or more amine groups directly attached to the ring system
 C07D 59/00 - 
C07D 83/00
Heterocyclic compounds having only sulphur, selenium, or tellurium as the hetero atom or atoms
 C07D 59/00
Heterocyclic compounds containing one or more rings each consisting of 1 sulphur atom and 2 carbon atoms
 C07D 61/00
Heterocyclic compounds containing one or more rings each consisting of 1 sulphur atom and 3 carbon atoms
 C07D 63/00
Heterocyclic compounds containing one or more rings each consisting of 1 sulphur atom and 4 carbon atoms
 C07D 63/02
·  Tetrahydrothiophenes
 C07D 63/04
·  ·  Substituted tetrahydrothiophenes
 C07D 63/06
·  ·  ·  gamma-thiolactones
 C07D 63/08
·  Dihydrothiophenes
 C07D 63/10
·  Thiophenes
 C07D 63/12
·  ·  Substituted thiophenes
 C07D 63/14
·  ·  ·  having more halogen directly attached to the ring
 C07D 63/16
·  ·  ·  having one or more carboxyl groups directly attached to the ring
 C07D 63/18
·  ·  Thiophenes condensed with one or more other rings
 C07D 63/20
·  ·  ·  Thionaphthenes
 C07D 63/22
·  ·  ·  ·  Substituted thionaphthenes
 C07D 63/24
·  ·  ·  Diphenylene sulphides
 C07D 65/00
Heterocyclic compounds containing one or more rings each consisting of 1 sulphur atom and 5 carbon atoms
 C07D 65/02
·  Tetrahydrothiopyrans (pentamethylene sulphides)
 C07D 65/04
·  ·  Substituted tetrahydrothiopyrans
 C07D 65/06
·  ·  ·  -thiolactones
 C07D 65/08
·  Dihydrothiopyrans
 C07D 65/10
·  Thiopyrans
 C07D 65/12
·  ·  Substituted thiopyrans
 C07D 65/14
·  ·  Thiopyrans condensed with one or more other rings
 C07D 65/16
·  ·  ·  Thioxanthenes
 C07D 65/18
·  ·  ·  ·  Thioxanthones
 C07D 67/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 1 sulphur atom and more than 5 carbon atoms
 C07D 69/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 2 sulphur atoms and 2 carbon atoms
 C07D 71/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 2 sulphur atoms and 3 carbon atoms
 C07D 71/02
·  5-thion-1,2-dithioles
 C07D 71/04
·  Lipoic acid; Derivative thereof
 C07D 73/00
Heterocyclic compounds containing one or more rings each consisting of 2 sulphur atom and 4 carbon atoms
 C07D 73/02
·  Diphenylene disulphide (Thianthrene)
 C07D 75/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 2 sulphur atoms and more than 4 carbon atoms
 C07D 77/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of more than 2 sulphur atoms and some carbon atoms
 C07D 77/02
·  Trimethylene trisulphone
 C07D 79/00
Heterocyclic compounds containing rings each of which has sulphur as the only hetero element, the rings differing one from another either in structure or composition or both
 C07D 81/00
Heterocyclic compounds having selenium as the hetero atom or atoms
 C07D 83/00
Heterocyclic compounds having tellurium as the hetero atom or atoms
 C07D 85/00 - 
C07D 99/00
Heterocyclic compounds having oxygen, nitrogen, sulphur, selenium, and tellurium in combinations of two or more different elements as the hetero atoms
 C07D 85/00 - 
C07D 99/00

Note(s)

A quarternary derivative of a heterocyclic N-compound is always classified as that compound.

 C07D 85/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 3,4, or 5 members, the members being 1 or more oxygen atoms, 1, or more nitrogen atoms, and 1 or more carbon atoms
 C07D 85/02
·  containing rings consisting of 3 members
 C07D 85/04
·  containing rings consisting of 4 members
 C07D 85/06
·  containing rings consisting of 5 members
 C07D 85/08
·  ·  Isoxazolidines
 C07D 85/10
·  ·  ·  Isoxazolidones
 C07D 85/12
·  ·  ·  ·  Amono-isoxazolidones with amine group(s) directly attached to the ring
 C07D 85/14
·  ·  ·  Dioxo-isoxazolidines
 C07D 85/16
·  ·  Isoxazolines
 C07D 85/18
·  ·  ·  Isoxazolones
 C07D 85/20
·  ·  ·  ·  Amono-isoxazolones group(s) directly attached to the ring
 C07D 85/22
·  ·  Isoxazoles
 C07D 85/24
·  ·  ·  Benzene sulphonamido isoxazoles
 C07D 85/26
·  ·  Oxazolidines
 C07D 85/28
·  ·  ·  Oxazolidones -(2) (cyclic urethanes)
 C07D 85/30
·  ·  ·  Oxazolidones -(4)
 C07D 85/32
·  ·  ·  Oxazolidones -(5)
 C07D 85/34
·  ·  ·  Dioxo-oxazolidines
 C07D 85/36
·  ·  Oxazolines
 C07D 85/38
·  ·  ·  Oxazolones -(2)
 C07D 85/40
·  ·  ·  Oxazolones -(4)
 C07D 85/42
·  ·  ·  Oxazolones -(5) (azlactones)
 C07D 85/44
·  ·  Oxazoles
 C07D 85/46
·  ·  ·  Benzene sulphonamido oxazoles
 C07D 85/48
·  ·  ·  Oxazoles condensed with one or more other rings
 C07D 85/50
·  ·  1,2,3-oxadiazoles (diazo oxides C07C 113/00)
 C07D 85/52
·  ·  1,2,4-oxadiazoles
 C07D 85/54
·  ·  1,3,4-oxadiazoles
 C07D 85/56
·  ·  1,2,5-oxadiazoles
 C07D 87/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 6 or more members, the members being 1 or more oxygen atoms, 1 or more nitrogen atoms, and 1 or more carbon atoms
 C07D 87/02
·  containing rings consisting of 6 members
 C07D 87/04
·  ·  Tetrahydro-1,2-oxazines
 C07D 87/06
·  ·  Tetrahydro-1,3-oxazines
 C07D 87/08
·  ·  ·  Tetrahydro-1,3-oxazinones
 C07D 87/10
·  ·  ·  Dioxo-tetrahydro-1,3-oxazines, e.g. isatoic anhydride
 C07D 87/12
·  ·  Dihydro-1,2-oxazines
 C07D 87/14
·  ·  Dihydro-1,3-oxazines
 C07D 87/16
·  ·  ·  Dihydro-1,3-oxazinones
 C07D 87/18
·  ·  1,2-oxazines
 C07D 87/20
·  ·  1,3-oxazines
 C07D 87/22
·  ·  Tetrahydro-1,4-oxazines (morpholines)
 C07D 87/24
·  ·  ·  Methods of preparation by ring closure
 C07D 87/26
·  ·  ·  Morpholines substituted by one or more hydrocarbon groups
 C07D 87/28
·  ·  ·  Other morpholine derivatives which are substituted in the ring and/or outside the ring
 C07D 87/30
·  ·  ·  ·  by one or more halogen atoms
 C07D 87/32
·  ·  ·  ·  by one or more hydroxyl groups and/or etherified hydroxyl groups
 C07D 87/34
·  ·  ·  ·  by one or more oxo groups
 C07D 87/36
·  ·  ·  ·  by one or more carboxyl groups, carboxylic acid ester groups, or carboxylic acid halide groups
 C07D 87/38
·  ·  ·  ·  by one or more nitrogen-containing groups
 C07D 87/40
·  ·  ·  ·  ·  by one or more amino groups
 C07D 87/42
·  ·  ·  ·  ·  by one or more carboxylic acid amide groups
 C07D 87/44
·  ·  ·  ·  ·  by one or more cyano groups
 C07D 87/46
·  ·  ·  ·  by one or more sulphur-containing groups
 C07D 87/48
·  ·  Dihydro-1,4-oxazines
 C07D 87/50
·  ·  1,4-oxazines
 C07D 87/52
·  ·  Oxadiazines
 C07D 87/54
·  containing rings consisting of 7 or more members
 C07D 89/00
Hetrocyclic compounds containing one or more rings each having the same structure and each consisting of 1 or more oxygen atoms, 1 or more sulphur atoms, and 1 or more carbon atoms
 C07D 89/02
·  containing rings consisting of 3 or 4 members
 C07D 89/04
·  containing rings consisting of 5 members
 C07D 89/06
·  ·  consisting of 1 oxygen atom, 1 sulphur atom and 3 carbon atoms, e.g. naphthosultones
 C07D 89/08
·  ·  consisting of 2 oxygen atoms, 1 sulphur atom and 2 carbon atoms, e.g. ethylene glycol sulphite
 C07D 89/10
·  containing rings consisting of 6 members
 C07D 89/12
·  ·  consisting of 1 oxygen atom, 1 sulphur atom and 4 carbon atoms
 C07D 89/14
·  ·  ·  1,4-Oxathianes (Thioxanes)
 C07D 89/16
·  ·  ·  Phenoxathiines
 C07D 89/18
·  ·  consisting of 2 oxygen atoms, 1 sulphur atom and 3 carbon atoms, e.g. 1,3-propylene glycol sulphite
 C07D 89/20
·  containing rings consisting of 7 or more members
 C07D 91/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 3,4 or 5 members, the members being 1 or more nitrogen atoms, 1 or more sulphur atoms and 1 or more carbon atoms
 C07D 91/02
·  containing rings consisting of 3 or 4 members
 C07D 91/04
·  containing rings consisting of 5 members
 C07D 91/06
·  ·  Isothiazolidines
 C07D 91/08
·  ·  ·  1,3-sultams
 C07D 91/10
·  ·  Isothiazolines
 C07D 91/12
·  ·  Isothiazoles
 C07D 91/14
·  ·  Thiazolidines
 C07D 91/16
·  ·  ·  Substituted thiazolidines
 C07D 91/18
·  ·  ·  ·  having one or more amine groups directly attached to the ring
 C07D 91/20
·  ·  ·  ·  having one or more mercapto groups directly attached to the ring
 C07D 91/22
·  ·  Thiazolines
 C07D 91/24
·  ·  ·  Substituted thiazolines
 C07D 91/26
·  ·  ·  ·  having one or more amine groups directly attached to the ring
 C07D 91/28
·  ·  ·  ·  having one or more mercapto groups directly attached to the ring
 C07D 91/30
·  ·  Thizoles
 C07D 91/32
·  ·  ·  Substituted thiazoles
 C07D 91/34
·  ·  ·  ·  having one or more amino groups directly attached to the ring
 C07D 91/36
·  ·  ·  ·  ·  Amino benzene sulphonyl-amido thiazoles (Sulphathiazoles)
 C07D 91/38
·  ·  ·  ·  having one or more mercapto groups directly attached to the ring
 C07D 91/40
·  ·  ·  ·  Thiazolsulphonamides
 C07D 91/42
·  ·  ·  Thiazoles condensed with one or more other rings
 C07D 91/44
·  ·  ·  ·  Benzothiazoles
 C07D 91/46
·  ·  ·  ·  having one or more amino groups directly attached to the ring system
 C07D 91/48
·  ·  ·  ·  having one or more mercapto groups directly attached to the ring system
 C07D 91/50
·  ·  ·  ·  Naphthothiazoles
 C07D 91/52
·  ·  ·  ·  Thiazolo-pyrimidines
 C07D 91/54
·  ·  1,2,3-thiadiazoles
 C07D 91/56
·  ·  ·  condensed with one or more other rings
 C07D 91/58
·  ·  ·  ·  1,2,3-thiadiazolo-pyrimidines
 C07D 91/60
·  ·  1,2,4-thiadiazoles
 C07D 91/62
·  ·  1,3,4-Thiadiazoles
 C07D 91/64
·  ·  ·  condensed with one or more other rings
 C07D 91/66
·  ·  ·  ·  1,3,4-thiadiazolo-pyrimidines
 C07D 91/68
·  ·  1,2,5-thiadiazoles
 C07D 91/70
·  ·  Dithia(mon)azoles
 C07D 93/00
Heterocyclic compounds containing one or more rings each having the same structure and each consisting of 6 or more members, the members being 1 or more nitrogen atoms, 1 or more sulphur atoms, and 1 or more carbon atoms
 C07D 93/02
·  1,2-thiazines
 C07D 93/04
·  ·  1,4-sultams
 C07D 93/06
·  1,3-thiazines
 C07D 93/08
·  ·  condensed with one or more other rings (cephalosporin C07D 99/24)
 C07D 93/10
·  1,4-thiazines
 C07D 93/12
·  ·  condensed with one or more other rings
 C07D 93/14
·  ·  ·  Phenothiazines
 C07D 93/16
·  ·  ·  Monoazaphenothiazines
 C07D 93/18
·  ·  ·  Di- and poly-azaphenothiazines
 C07D 93/20
·  Dithia(mon)azines
 C07D 93/22
·  Thiadiazines
 C07D 93/24
·  ·  1,2,6-thiadiazines
 C07D 93/26
·  ·  1,3,5-thiadiaziens
 C07D 93/28
·  ·  condensed with one or more other rings
 C07D 93/30
·  ·  ·  Benzothiadiazines
 C07D 93/32
·  ·  ·  ·  Benzo-1,2,4-thiadiazines
 C07D 93/34
·  ·  ·  ·  ·  Sulphamyl benzo-1,2,4-thiadiazines
 C07D 93/36
·  containing rings consisting or 7 or more members
 C07D 93/38
·  ·  Thiazepines
 C07D 93/40
·  ·  ·  condensed with one or more other rings
 C07D 93/42
·  ·  ·  ·  Dibenzothiazepines
 C07D 93/44
·  ·  Thiazocines
 C07D 95/00
Heterocyclic compounds containing one or more rings each consisting of 1 or more oxygen atoms, 1 or more nitrogen atoms, 1 or more sulphur atoms, and 1 or more carbon atoms
 C07D 97/00
Heterocyclic compounds containing one or more rings each consisting of 1 or more selenium atoms and/or tellurium atoms in combination with 1 or more oxygen atoms and/or nitrogen atoms
 C07D 97/02
·  Selenazoles
 C07D 99/00
Heterocyclic compounds, not provided for elsewhere in sub-class C07D, having oxygen, nitrogen, sulphur, selenium, and tellurium in combinations of two or more different elements as the only hetero atoms (scopoline C07D 43/16; morphine C07D 43/32; strychnine C07D 43/34)
 C07D 99/02
·  containing different heterocyclic rings
 C07D 99/04
·  ·  with nitrogen and oxygen as the hetero atoms in different rings
 C07D 99/06
·  ·  with nitrogen and sulphur as the hetero atoms in different rings
 C07D 99/08
·  ·  ·  Biotin
 C07D 99/10
·  ·  in which at least one ring has nitrogen and sulphur together as hetero atoms and another ring has oxygen, nitrogen, or sulphur as the hetero atom
 C07D 99/12
·  ·  ·  Vitamin B1; Derivatives therof
 C07D 99/14
·  ·  ·  Penicillanic acids
 C07D 99/16
·  ·  ·  ·  Penicillins; Salts or derivatives thereof with inorganic bases
 C07D 99/18
·  ·  ·  ·  ·  Purification; Stabilisation
 C07D 99/20
·  ·  ·  ·  ·  Salts with organic bases
 C07D 99/22
·  ·  ·  ·  ·  Derivatives, e.g. halides, anhydrides, esters
 C07D 99/24
·  ·  ·  Cephalosporin C and derivatives thereof, e.g. 7-amino-cephalosporanic acid
 C07D 101/00
Steroids with a nuclear skeleton modified by having one or more heterocyclic rings in place of carbocyclic rings
 C07D 101/00
Steroids in which one or more of the carbocyclic rings of the basic skeleton have been replaced by heterocyclic rings
 C07D 103/00 - 
C07D 109/00
Heterocyclic compounds having elements other than oxygen, nitrogen, sulphur, selenium, and tellurium as the hetero atom or atoms
 C07D 103/00
Heterocyclic compounds containing one or more rings having an element of the 4th Group of the Periodic System as the hetero atom or atoms
 C07D 103/02
·  Silicon compounds
 C07D 103/04
·  ·  Cyclic esters of silicic acids
 C07D 105/00
Heterocyclic compounds containing one or more rings having an element of the 5th Group of the Periodic System as the hetero atom or atoms
 C07D 105/02
·  Phosphorus compounds
 C07D 105/04
·  ·  Cyclic esters of acids of phosphorus
 C07D 105/06
·  Arsenic compounds
 C07D 107/00
Other heterocyclic compounds
 C07D 107/02
·  Boron compounds
 C07D 109/00
Cyclic compounds having at least one ring containing no carbon
 C07D 109/02
·  containing boron in the ring
 C07D 109/04
·  containing silicon in the ring