InChI=1S/C18H20O8S/c1-11-15(24-2)10-16(25-3)17(18(11)20)14(19)9-6-12-4-7-13(8-5-12)26-27(21,22)23/h4-5,7-8,10,20H,6,9H2,1-3H3,(H,21,22,23)