13466-37-0 2(1H)-Pyridinone, 3,5-dichloro- 2(1H)-Pyridone, 3,5-dichloro- 2-Pyridinol, 3,5-dichloro- 3,5-Dichloro-2-pyridone 5437-33-2 EINECS 226-609-3 NSC 16021