1193-56-2 2125-81-7 4(1H)-Pyrimidinone, 5-chloro-6-hydroxy- 4(3H)-Pyrimidinone, 5-chloro-6-hydroxy- 5-Chloro-4,6-dihydroxypyrimidine 5-Chloro-6-hydroxy-1H-pyrimidin-4-one EINECS 214-774-4 NSC 42601