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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C07D311/78
Ring systems having three or more relevant rings
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C07D311/80
Dibenzopyrans; Hydrogenated dibenzopyrans
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C07D311/84
with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 9
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C07D311/86
Oxygen atoms, e.g. xanthones
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