126101-08-4 1H-Pyrrolo(1,2-a)imidazole-7a(5H)-carboxylic acid, tetrahydro-2,5-dioxo-, ethyl ester Ethyl 2,5-dioxohexahydro-1H-pyrrolo(1,2-a)imidazole-7a-carboxylate Ethyl tetrahydro-2,5-dioxo-1H-pyrrolo(1,2-a)imidazole-7a(5H)-carboxylate