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