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4-Amino-5-(pyridin-3-yl)-4H-1,2,4-triazole-3-thiol 1 were condensed with 2-bromo-1-(substituted phenyl)ethanone to give pyridinyltriazolothiadiazines 2a～c, which were quaternarized with methyl iodide and oxidized with 30 % hydrogen peroxide to afford the