Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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209/00
Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
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C07D209/56
Ring systems containing three or more rings
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C07D209/80
[b, c]- or [b, d]-condensed
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C07D209/82
Carbazoles; Hydrogenated carbazoles
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C07D209/86
with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to carbon atoms of the ring system
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