title: 1981 annual report: evaluation of new compounds for opioid activity.
mesh_terms: D000818:Animals; D004353:Drug Evaluation, Preclinical; D006168:Guinea Pigs; D006801:Humans; D008253:Macaca mulatta; D051379:Mice; D008815:Mice, Inbred Strains; D009294:Narcotics; D009293:Opioid-Related Disorders; D051381:Rats; D011919:Rats, Inbred Strains; D012646:Self Administration
chemical_list: D009294:Narcotics