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