3(2H)-Pyridazinone, 6-(5-chloro-3-methyl-1H-pyrazol-1-yl)-, hydrazone 5-25-17-00457 (Beilstein Handbook Reference) 6-(5-Chloro-3-methyl-1H-pyrazol-1-yl)-3(2H)-pyridazinone hydrazone 70589-17-2 BRN 0797217