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