Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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317/00
Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
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C07D317/08
having the hetero atoms in positions 1 and 3
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C07D317/44
ortho- or peri-condensed with carbocyclic rings or ring systems
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