title: Use of orthogonal polynomials for unequal intervals to eliminate interference in spectrophotometric analysis. Simultaneous determination of ephedrine hydrochloride and diphenhydramine hydrochloride in two-component mixtures.
mesh_terms: D004155:Diphenhydramine / Q000032:analysis*; D004338:Drug Combinations; D004809:Ephedrine / Q000032:analysis*; D008433:Mathematics; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004338:Drug Combinations; D004155:Diphenhydramine; D004809:Ephedrine