The assay of the agonist activities of N-methyl- and N-nor-homologues of morphine derivatives by the guinea-pig ileum method.
D000818:Animals; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects*; D066298:In Vitro Techniques; D009022:Morphine Derivatives / Q000494:pharmacology*; D009130:Muscle, Smooth / Q000187:drug effects; D013329:Structure-Activity Relationship
D009022:Morphine Derivatives