the selective mu opioid agonist , ( d-ala2-n-me-phe4-gly5-ol ) -enkephalin ( dago ) , and the selective kappa opioid agonist , trans- ( +/- ) -3,4-dichloro-n- ( 2- ( 1-pyrrolidinyl ) cyclohexyl ) benzeneacetamide , u-50488h , caused concentration-dependent and naloxone-reversible inhibitions of nerve-mediated contractions .
C0014298
enkephalin
C0525773
dago