title: Tetrapeptide acyl-hydrazide analogs of enkephalin: a new group of potent analgesics.
mesh_terms: D000818:Animals; D001681:Biological Assay; D004723:Endorphins / Q000138:chemical synthesis / Q000494:pharmacology; D004745:Enkephalins / Q000138:chemical synthesis / Q000494:pharmacology; D006358:Hot Temperature; D006834:Hydrazines / Q000138:chemical synthesis / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D010146:Pain; D013329:Structure-Activity Relationship
chemical_list: D004723:Endorphins; D004745:Enkephalins; D006834:Hydrazines