Nifedipine Impurity I Catalogue S220319 CAS 114709-68-1 M.W 331.11 M.F C16H17N3O5 Specifications FAQs Synonyms: 5-(Aminocarbonyl)-1,4-dihydro-2,6-dimethyl-4-(2-nitrophenyl)-3-pyridinecarboxylic Acid Methyl Ester