2,4(1H,3H)-Pyrimidinedione, 5,6-diamino-1,3-dimethyl- 4,5-Diamino-1,3-dimethyluracil 5,6-Diamino-1,3-dimethyluracil 5440-00-6 NSC15493 Uracil, 5,6-diamino-1,3-dimethyl-