title: Synthetic studies on enkephalin analogs. I. Potent analgesic activity of H-Tyr-D-Ala-Gly-Phe-NHNH-CO-R (R = lower alkyl).
mesh_terms: D000700:Analgesics / Q000138:chemical synthesis*; D000818:Animals; D004723:Endorphins / Q000138:chemical synthesis*; D004745:Enkephalins / Q000138:chemical synthesis* / Q000494:pharmacology; D008297:Male; D051379:Mice
chemical_list: D000700:Analgesics; D004723:Endorphins; D004745:Enkephalins