126101-07-3 1H-Pyrrolo(1,2-a)imidazole-7a(5H)-carboxylic acid, tetrahydro-2,5-dioxo- 2,5-Dioxohexahydro-1H-pyrrolo(1,2-a)imidazole-7a-carboxylic acid Tetrahydro-2,5-dioxo-1H-pyrrolo(1,2-a)imidazole-7a(5H)-carboxylic acid