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The important synthetic precursor(Ⅲ), 1-(prop-2-yn-1-yl)-7,8-dihydro-1Hbenzo[d][1,3]thiazine-2,5(4H,6H)-dione(C_(11)H_(11)NO_2S), was prepared through a three-component reaction, which was further transferred into cytotoxic triazoles by alkylation and