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