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