Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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307/00
Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
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C07D307/77
ortho- or peri-condensed with carbocyclic rings or ring systems
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C07D307/87
Benzo [c] furans; Hydrogenated benzo [c] furans
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