103614-28-4

Dynorphin A ethylamide (1-9), The opioid activities were examined in the bioassays (guinea pig ileum, mouse vas deferens and rabbit vas deferens). the extension of the C-terminal in the peptide chain of [MeArg7,D-Leu8]-Dyn(1-8)-NH2 analogues by Arg is ineffective for increasing the kappa-opioid activities, kappa-receptor selectivity and/or analgesic effects of the peptides.