Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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257/00
Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms
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C07D257/10
condensed with carbocyclic rings or ring systems
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C07D257/12
Six-membered rings having four nitrogen atoms
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