InChI=1S/C18H18O8S/c1-10-16(20)12(9-25-27(21,22)23)18(24-2)15-13(19)8-14(26-17(10)15)11-6-4-3-5-7-11/h3-7,14,20H,8-9H2,1-2H3,(H,21,22,23)