title: Employing ionization behaviors to resolve a trace-level impurity: determination of 1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)-3,5- pyridinedicarboxylic acid di-2-[methyl-(phenylmethyl)amino]ethyl ester in nicardipine drug substance.
authors: Du Pont Merck Pharmaceutical Company, Wilmington, Delaware 19880-0336.
authors: M B
authors: MB
authors: Maurin
authors: R D
authors: RD
authors: Vickery
authors: P
authors: P
authors: Ma
authors: J
authors: J
authors: Manalo
authors: M A
authors: MA
authors: Hussain
mesh_terms: D002852:Chromatography, Ion Exchange; D004340:Drug Contamination; D006863:Hydrogen-Ion Concentration; D009529:Nicardipine / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry* / Q000592:standards; D011199:Potentiometry
chemical_list: C078981:XE 820; D009529:Nicardipine