Abstract
Cyclic dermorphin-like tetrapeptides with delta-opioid receptor selectivity. 3. Effect of residue 3 modification on in vitro opioid activity.
H I Mosberg, D L Heyl, R C Haaseth, J R Omnaas, F Medzihradsky and C B Smith
Molecular Pharmacology December 1990, 38 (6) 924-928;