title: Spectrophotometric determination of quinine, emethine and ephedrine in pharmaceutical preparations with tetrabromophenolphthalein ethyl ester by solvent extraction.
mesh_terms: D004640:Emetine / Q000032:analysis*; D004809:Ephedrine / Q000032:analysis*; D008722:Methods; D010635:Phenolphthaleins; D011803:Quinine / Q000032:analysis*; D013053:Spectrophotometry
chemical_list: D010635:Phenolphthaleins; D011803:Quinine; D004809:Ephedrine; D004640:Emetine