Nifedipine EP Impurity A Catalogue S220311 CAS 67035-22-7 M.W 344.32 M.F C17H16N2O Specifications FAQs Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)pyridine-3,5-dicarboxylate ;Dimethyl 4-(2-nitrophenyl)-2,6-dimethylpyridine-3,5-dicarboxylate ;