Problem to be solved: to provide a novel compound having a stronger antitumor activity, less toxic and side effects, less resistant to treatment of tumor cells, and a method of producing such a compound.Method for preparing oxithiazine like compound and the following compound and use of the compound to tumor cell.No selection【課題】より強力な抗腫瘍活性を有し、毒性及び副作用が少なく、腫瘍細胞の治療に対する耐性が少ない新たな化合物、及びかかる化合物を作製する方法の提供。【解決手段】オキサチアジン様化合物及び下記化合物の作成方法および該化合物の腫瘍細胞への使用。【選択図】なし