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1,6-Dihydro-3-hydrozinocarbonyl-6-pyridazinone(compound 2) were prepared from α-ketoglutaric acid and hydrazine hydrate. A series of N-aryl-2-(1' ,6'-dihydro-6'-pyridazinone-3'-earbonyl) thiosemicarbazides 3a-3f were synthesized from the r