InChI=1S/C18H22O8S/c1-12(19)18(20,14-6-10-16(25-3)11-7-14)17(26-27(21,22)23)13-4-8-15(24-2)9-5-13/h4-12,17,19-20H,1-3H3,(H,21,22,23)