3(2H)-Pyridazinone, 6-(4-thiomorpholinyl)-, hydrazone, dihydrochloride 3-Hydrazino-6-(tetrahydro-1,4-thiazino)pyridazine dihydrochloride 56393-07-8 6-(4-Thiomorpholinyl)-3(2H)-pyridazinone hydrazone dihydrochloride