2-[[4-(benzoyl)-1-methylpyrrol-2-yl]methylidene]propanedioic acid
2-[[4-(benzoyl)-1-methyl-pyrrol-2-yl]methylene]propanedioic acid
2-[[1-methyl-4-(oxo-phenylmethyl)-2-pyrrolyl]methylene]propanedioic acid
2-[[4-(benzoyl)-1-methyl-pyrrol-2-yl]methylene]malonic acid
2-[(1-methyl-4-phenylcarbonyl-pyrrol-2-yl)methylidene]propanedioic acid