2(1H)-Pyridinone, 5-chloro-3-hydroxy- (9CI) 2,3-Pyridinediol, 5-chloro- 5-Chloro-2,3-pyridinediol 5-Chloro-3-hydroxy-2-pyridone 53233-89-9 EINECS 258-441-1 NSC 137836