英文别名BIBF1120 Intermediate4; Nintedanib ethanesulfonate intermediates; (3E)-2,3-Dihydro-3-(methoxyphenylmethylene)-2-oxo-1H-indole-6-carboxylic acid methyl ester; 1H-Indole-6-carboxylic acid, 2,3-dihydro-3-(methoxyphenylmethylene)-2-oxo-, methyl ester, (3E)-; Nintedanib Intermediate 4; 3-[1-methoxy-1-phenylmeth-(E)-ylidene]-2-oxo-2,3-dihydro-1H-indole-6-carboxylic acid methyl ester; Methyl (3E)-3-[methoxy(phenyl)methylene]-2-oxo-6-indolinecarboxylate