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