C
CHEMISTRY; METALLURGY
C
CHEMISTRY; METALLURGY
C07
ORGANIC CHEMISTRY
C07
ORGANIC CHEMISTRY
C07D
HETEROCYCLIC COMPOUNDS
C07D
HETEROCYCLIC COMPOUNDS
C07D257/00
Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms
C07D257/00
Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms
C07D257/02
not condensed with other rings
C07D257/02
not condensed with other rings