[H][H].[CH3:3][C:4]1[NH:5][C:6](=[O:19])[S:7][C:8]=1[C:9](=[O:18])[C:10]1[CH:15]=[CH:14][C:13]([S:16][CH3:17])=[CH:12][CH:11]=1.[OH2:20]>C(O)(=O)C>[CH3:3][C:4]1[NH:5][C:6](=[O:19])[S:7][C:8]=1[C:9](=[O:18])[C:10]1[CH:11]=[CH:12][C:13]([S:16]([CH3:17])=[O:20])=[CH:14][CH:15]=1Hydrogen peroxude (1 equivalent, 30%) is added to a solution of 4-methyl-5-[4-(methylthio)benzoyl)-2(3H)-thiazolone (2.7 g) in glacial acetic acid (80 ml). The mixture is stirred for 3 hours at 50° C. The precipatate obtained on addition of water is recrystallized from ethanol to give the title compound.
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