1672-50-0 4(1H)-Pyrimidinone, 5,6-diamino- 4(3H)-Pyrimidinone, 5,6-diamino- 4,5-Diamino-6-hydroxypyrimidine 4-Pyrimidinol, 5,6-diamino- 5,6-Diamino-4(3H)-pyrimidinone NSC36908