1,3,4,6-Tetraacetyltetrahydroimidazo(4,5-d)imidazole-2,5(1H,3H)-dione 10543-60-9 EINECS 234-124-3 Imidazo(4,5-d)imidazole-2,5(1H,3H)-dione, 1,3,4,6-tetraacetyltetrahydro-