Bentley compounds

The Bentley compounds are a class of semi-synthetic opioids that were first synthesized by K. W. Bentley by Diels-Alder reaction of thebaine with various dienophiles. The compounds are properly known as thevinols and orvinols, or `bridged oripavine derivatives`, due to the characteristic 6,14-endo-etheno- bridge and substitution at the 7α posit.....
Found on http://en.wikipedia.org/wiki/Bentley_compounds
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