Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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311/00
Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
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C07D311/02
ortho- or peri-condensed with carbocyclic rings or ring systems
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C07D311/04
Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
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C07D311/06
with oxygen or sulfur atoms directly attached in position 2
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C07D311/08
not hydrogenated in the hetero ring
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C07D311/12
substituted in position 3 and unsubstituted in position 7
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