InChI=1S/C19H20O7S/c1-4-5-12-6-7-16-14(8-12)11(2)18(25-16)13-9-15(20)19(17(10-13)24-3)26-27(21,22)23/h4-11,18,20H,1-3H3,(H,21,22,23)