(Z) -Methyl 3- (((4- (methylamino) phenyl) amino) (phenyl) methylene) -2-oxoindoline-6-carboxylate (Nintedanib Impurity) (Standard) is the analytical standard of (Z) -Methyl 3- (((4- (methylamino) phenyl) amino) (phenyl) methylene) -2-oxoindoline-6-carboxylate (Nintedanib Impurity) . This product is intended for research and analytical applications.