5-trifluoromethyl-1H-2-benzothiopyran-1-one 生成 6aα,6bα,12bα,12cα-1,7-(bis)trifluoromethyl-tetrahydrocyclobuta[1,2-c;4,3-c']bis([2]benzothiopyran)-5,8-dione 、 6aα,6bα,12bα,12cα-1,12-(bis)trifluoromethyl-tetrahydrocyclobuta[1,2-c;4,3-c']bis([2]benzothiopyran)-5,8-dione