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