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Ref 7
editRef 7 deals with the optical isomers and substitution of the pyridine ring. 3,3-dimethyl is the most potent and is still less potent than morphine. Considering the 5 step synthesis, this is of academic interest. No data exists on other N-piperidine opioids to see if potency is changed. Put simply, the 3,3 equates to the 3,3 dimethyl of the fentanyl class. — Preceding unsigned comment added by 81.99.74.135 (talk) 11:31, 5 March 2017 (UTC)
>fentanyl potency
editAdding a 4-aryl group produced a compound that is x60 morphine. Combined with the 3,3 moiety, compounds in the region of 1000s of x morphine are possible. Of course, fentanyl synthesis is much simpler and the scope of the class means that ANPP analogues with a (2-furanyl) ethyl amine are x3 more potent while (2-thiazole) ethylamine is equipotent but with double the duration. This is of no commercial use but it's important to see how this class overlays fentanyl. — Preceding unsigned comment added by 81.99.74.135 (talk) 16:45, 16 March 2017 (UTC)