title: Analgesic effectiveness of the narcotic agonist-antagonists.
mesh_terms: D009020:Morphine; D009269:Nalorphine; D009292:Narcotic Antagonists / Q000627:therapeutic use*; D009294:Narcotics / Q000627:therapeutic use*; D011957:Receptors, Opioid / Q000502:physiology; D013329:Structure-Activity Relationship
chemical_list: D009292:Narcotic Antagonists; D009294:Narcotics; D011957:Receptors, Opioid; D009020:Morphine; D009269:Nalorphine