C CHEMISTRY; METALLURGY
C07 ORGANIC CHEMISTRY
C07D HETEROCYCLIC COMPOUNDS
207/00 Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
C07D207/02 with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
C07D207/04 having no double bonds between ring members or between ring members and non-ring members
C07D207/08 with hydrocarbon radicals, substituted by hetero atoms, attached to ring carbon atoms