4-(2,3-Dimethylmaleimido)hippuric acid 83560-86-5 DMMHA Glycine, N-(4-(2,5-dihydro-3,4-dimethyl-2,5-dioxo-1H-pyrrol-1-yl)benzoyl)- N-(4-(2,5-Dihydro-3,4-dimethyl-2,5-dioxo-1H-pyrrol-1-yl)benzoyl)glycine