title: Stereochemical considerations in structural comparison of enkephalins and endorphins with exogenous opiate agents.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D004723:Endorphins / Q000494:pharmacology; D004745:Enkephalins / Q000494:pharmacology; D008968:Molecular Conformation; D009294:Narcotics / Q000494:pharmacology; D013329:Structure-Activity Relationship
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009294:Narcotics