title: [Application of second derivative spectrometry to the determination of bromhexine hydrochloride and spectrophotometry to the determination of dyphylline in compound preparations].
mesh_terms: D001964:Bromhexine / Q000032:analysis*; D004339:Drug Compounding; D004400:Dyphylline / Q000032:analysis*; D005100:Expectorants / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet; D013806:Theophylline / Q000031:analogs & derivatives*
chemical_list: D005100:Expectorants; D004400:Dyphylline; D013806:Theophylline; D001964:Bromhexine