Patent classifications
C
CHEMISTRY; METALLURGY
Load children
C07
ORGANIC CHEMISTRY
Load children
C07D
HETEROCYCLIC COMPOUNDS
Load children
257/00
Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms
Load children Filter patents View analytics View as hierarchy
C07D257/02
not condensed with other rings
Load children Filter patents View analytics View as hierarchy