Opioid receptor binding and in vivo antinociceptive activity of position 3-substituted morphiceptin analogs.


Analogs of morphiceptin (Tyr-Pro-Phe-Pro-NH2), a mu-selective opioid receptor ligand, with position 3-modifications, including altered size, lipophilicity, and electronic character, while maintaining aromaticity were synthesized. The activity of the new analogs in in vitro assays and in in vivo hot-plate test of analgesia was compared and the results were… (More)


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