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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C07D209/62
Naphtho [c] pyrroles; Hydrogenated naphtho [c] pyrroles
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