Synonyms: ethyl (2Z)-2-(2-oxo-1,2-dihydro-3H-indol-3-ylidene)hydrazinecarboxylate;hydrazinecarboxylic acid, 2-(1,2-dihydro-2-oxo-3H-indol-3-ylidene)-, ethyl ester, (2E)-;hydrazinecarboxylic acid, 2-(1,2-dihydro-2-oxo-3H-indol-3-ylidene)-, ethyl ester, (2Z)-