2-Amino-4,6-dihydroxypyrimidine 2-Iminobarbituric acid 4,6(1H,5H)-Pyrimidinedione, 2-amino- 4,6(1H,5H)-Pyrimidinedione, dihydro-2-imino- 4425-67-6 Guanidine, malonyl- Malonylguanidine NSC227875