Nintedanib Impurity B Catalogue N225712 CAS N/A M.W 553.65 M.F C32H35N5O4 Specifications FAQs Nintedanib N-Ethyl Analog ; (Z)-Methyl 3-((4-(2-(4-ethylpiperazin-1-yl)-N-methylacetamido)phenylamino)(phenyl)methylene)-2-oxoindoline-6-carboxylate