Synonyms: 1H-Pyrrole-3-propanoic acid, 5-((1,2-dihydro-2-oxo-3H-indol-3-ylidene)methyl)-2,4-dimethyl-;1H-Pyrrole-3-propanoic acid, 5-[(Z)-(1,2-dihydro-2-oxo-3H-indol-3-ylidene)methyl]-2,4-dimethyl-;3-(2,4-Dimethyl-5-((2-oxo-1,2-dihydro-3H-indol-3-ylidene)methyl)-1H-pyrrol-3-yl)propionic acid;3-(2,4-Dimethyl-5-(2-oxo-1,2-dihydroindol-3-ylidenemethyl)-1H-pyrrol-3-yl)propionic acid;3-{2,4-Dimethyl-5-[(Z)-(2-oxo-1,2-dihydro-3H-indol-3-ylidene)methyl]-1H-pyrrol-3-yl}propanoic acid;5-((1,2-dihydro-2-oxo-3H-indol-3-ylidene)methyl)-2,4-dimethyl-1H-pyrrole-3-propanoic acid