Nifedipine Impurity L Catalogue S220322 CAS 53055-15-5 M.W 360.13 M.F C18H20N2O6 Specifications FAQs Synonyms: 3-ethyl 5-methyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate