Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C 07 D 451/00 to C 07 D 463/00 [2,5]
471
/
02
•
in which the condensed system contains two hetero rings [2]
471
/
04
•
•
Ortho-condensed systems (carbacephams, e.g. homothienamycins, C 07 D 463/00) [2,5]
471
/
06
•
•
Peri-condensed systems [2]
471
/
08
•
•
Bridged systems [2]
471
/
10
•
•
Spiro-condensed systems [2]
471
/
12
•
in which the condensed system contains three hetero rings [2]
471
/
14
•
•
Ortho-condensed systems [2]
471
/
16
•
•
Peri-condensed systems [2]
471
/
18
•
•
Bridged systems [2]
471
/
20
•
•
Spiro-condensed systems [2]
471
/
22
•
in which the condensed systems contains four or more hetero rings [2]
473
/
00
Heterocyclic compounds containing purine ring systems [2]
473
/
02
•
with oxygen, sulfur, or nitrogen atoms directly attached in positions 2 and 6 [2]
473
/
04
•
•
two oxygen atoms [2]
473
/
06
•
•
•
with radicals containing only hydrogen and carbon atoms, attached in position 1 or 3 [2]
473
/
08
•
•
•
•
with methyl radicals in positions 1 and 3, e.g. theophylline [2]
473
/
10
•
•
•
•
with methyl radicals in positions 3 and 7, e.g. theobromine [2]
473
/
12
•
•
•
•
with methyl radicals in positions 1, 3, and 7, e.g. caffeine [2]
473
/
14
•
•
•
•
with two methyl radicals in positions 1 and 3 and two methyl radicals in positions 7, 8, or 9 [2]
473
/
16
•
•
two nitrogen atoms [2]
473
/
18
•
•
one oxygen and one nitrogen atom, e.g. guanine [2]
473
/
20
•
•
two sulfur atoms [2]
473
/
22
•
•
one oxygen and one sulfur atom [2]
473
/
24
•
•
one nitrogen and one sulfur atom [2]
473
/
26
•
with an oxygen, sulfur, or nitrogen atom directly attached in position 2 or 6, but not in both [2]
473
/
28
•
•
Oxygen atom [2]
473
/
30
•
•
•
attached in position 6, e.g. hypoxanthine [2]
473
/
32
•
•
Nitrogen atom [2]
473
/
34
•
•
•
attached in position 6, e.g. adenine [2]
473
/
36
•
•
Sulfur atom [2]
473
/
38
•
•
•
attached in position 6 [2]
473
/
40
•
with halogen atoms or perhalogeno-alkyl radicals directly attached in position 2 or 6 [2]
475
/
00
Heterocyclic compounds containing pteridine ring systems [2]
475
/
02
•
with an oxygen atom directly attached in position 4 [2]
475
/
04
•
•
with a nitrogen atom directly attached in position 2 [2]
475
/
06
•
with a nitrogen atom directly attached in position 4 [2]
475
/
08
•
•
with a nitrogen atom directly attached in position 2 [2]
475
/
10
•
•
with an aromatic or hetero-aromatic ring directly attached in position 2 [2]
475
/
12
•
containing pteridine ring systems condensed with carbocyclic rings or ring systems [3]
