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4-Chloro-2-(1,1-dimethylethyl)-5-mercapto-3(2H)-pyridazinone is an intermediate used in the synthesis of Pyridaben is a pyridazinone derivative used as an insecticide and acaricide. In the European Union, Pyridaben has been authorized for use as an insecticide and acaricide from 1 May 2011. In Germany, Austria and Switzerland, no plant protection products containing this active substance are authorized. Pyridaben is a colorless solid that is practically insoluble in water. Cannabis testing.