1H-Pyrrolo(2,3-d)pyrimidine-2,4(3H,5H)-dione, 3-butyl- 3-Butyl-1H-pyrrolo(2,3-d)pyrimidine-2,4(3H,5H)-dione 3-Butyl-2,4-dioxo-1,2,3,4-tetrahydropyrrolo(3,2-d)pyrimidine 55276-28-3 BRN 0653695