Agonist vs antagonist behavior of delta opioid peptides containing novel phenylalanine analogues in place of Tyr(1).


The novel phenylalanine analogues 4'-[N-((4'-phenyl)phenethyl)carboxamido]phenylalanine (Bcp) and 2',6'-dimethyl-4'-[N-((4'-phenyl)phenethyl)carboxamido]phenylalanine (Dbcp) were substituted for Tyr(1) in the delta opioid antagonist TIPP (H-Tyr-Tic-Phe-Phe-OH; Tic = tetrahydroisoquinoline-3-carboxylic acid). Unexpectedly, [Bcp(1)]TIPP was a potent… (More)
DOI: 10.1021/jm9004913


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