title: Stereospecific interaction of the quaternized opiate, N-methyllevorphanol, with opiate receptors.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D007981:Levorphanol / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D008968:Molecular Conformation; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D000644:Quaternary Ammonium Compounds / Q000378:metabolism / Q000494:pharmacology; D011955:Receptors, Drug; D013329:Structure-Activity Relationship
chemical_list: D000644:Quaternary Ammonium Compounds; D011955:Receptors, Drug; D007981:Levorphanol