title: Effects of small changes in chemical structure on stereospecificity.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D001285:Atropine / Q000494:pharmacology; D001665:Binding Sites; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D008968:Molecular Conformation; D011950:Receptors, Cholinergic / Q000187:drug effects; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D014326:Tropanes / Q000494:pharmacology
chemical_list: D011950:Receptors, Cholinergic; D014326:Tropanes; D001285:Atropine; D000109:Acetylcholine