Nintedanib Impurity D Catalogue N225714 CAS 1139455-52-9 M.W 553.65 M.F C32H35N5O4 Specifications FAQs Nintedanib Ethyl Ester ; (Z)-Ethyl 3-((4-(N-methyl-2-(4-methylpiperazin-1-yl)acetamido)phenylamino)(phenyl)methylene)-2-oxoindoline-6-carboxylate