title: Quantitative structure activity relationships of analgesics, narcotic antagonists, and hallucinogens: introduction.
mesh_terms: D000818:Animals; D008954:Models, Biological; D004364:Pharmaceutical Preparations / Q000378:metabolism; D011955:Receptors, Drug / Q000502:physiology; D013329:Structure-Activity Relationship
chemical_list: D004364:Pharmaceutical Preparations; D011955:Receptors, Drug