1 SU1 3-[(3-(2-carboxyethyl)-4-methylpyrrol-2-yl)methylene]-2-indolinone 1.000 2 X2M (3z)-3-[(3,5-dimethyl-1h-pyrrol-2-yl)methylidene]-1,3-dihydro-2h-indol-2-one 0.739 3 X2K (3z)-5-amino-3-[(3,5-dimethyl-1h-pyrrol-2-yl)methylidene]-1,3-dihydro-2h-indol-2-one 0.708