Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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489/00
Heterocyclic compounds containing 4aH-8, 9 c- Iminoethano-phenanthro [4, 5-b, c, d] furan ring systems, e.g. derivatives of [4, 5-epoxy]-morphinan of the formula:
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C07D489/02
with oxygen atoms attached in positions 3 and 6, e.g. morphine, morphinone
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