3(2H)-Pyridazinone, 6-((2-hydroxyethyl)phenylamino)-, hydrazone, dihydrochloride 3-Hydrazino-6-(N-(2-hydroxyethylanilino))pyridazine dihydrochloride 56393-12-5 6-((2-Hydroxyethyl)phenylamino)-3(2H)-pyridazinone hydrazone dihydrochloride