1,5-Dihydropyrrolo[3,2-a]pyrimidine-2,4-dion (CAS NO.65996-50-1), its Synonyms are 1-Pyrrolo[3,2-d]pyrimidine-2,4(3H,5H)-dione ; 1,5-dihydro-pyrrolo[3,2-a]pyri ; Pyrolo[3,2-d]pyrimidin-2,4(1H,3H)-dione .