title: A simultaneous determination of norephedrine, pseudoephedrine, ephedrine and methylephedrine in Ephedrae Herba and oriental pharmaceutical preparations by ion-pair high-performance liquid chromatography.
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004809:Ephedrine / Q000031:analogs & derivatives / Q000032:analysis; D008518:Medicine, East Asian Traditional; D010665:Phenylpropanolamine / Q000032:analysis; D010946:Plants, Medicinal / Q000032:analysis*
chemical_list: D010665:Phenylpropanolamine; D004809:Ephedrine