Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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493/00
Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system
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C07D493/02
in which the condensed system contains two hetero rings
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C07D493/06
Peri-condensed systems
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