4(1H)-Pyrimidinone, 5,6-diamino-, sulfate (1:1) 4,5-Diamino-6-hydroxypyrimidine sulfate 4-Oxo-1H-pyrimidin-5,6-diammonium sulphate 52502-66-6 53435-17-9 AI3-52140 EINECS 257-971-0