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As part of ongoing research programme on bicyclic heterocycles     we have elaborated a new approach to 1H-pyrazolo[4,3-e][1,2,4]triazine derivative 3 and its synthetic precursor 2 by reaction of oxime 5-acetyl-3-(methylsulfanyl)-1,2,4-triazine (1) with phenylhydrazine hydrochloride under different reaction conditions. Phenylhydrazone of 5-acetyl-3-(methylsulfanyl)-1,2,4-triazine 2 To a solution of the oxime 1 (184 mg, 1 mmol) and phenylhydrazine hydrochloride (288 mg, 2 mmol) indoi:10.3390/m404 fatcat:hrj35mypjndvxm2km46wvtbzcm