InChI=1S/C18H26O8S/c1-18(2,20)11-7-5-4-6-8-17(19)25-13-14-9-10-15(16(12-14)24-3)26-27(21,22)23/h7,9-12,20H,4-6,8,13H2,1-3H3,(H,21,22,23)/b11-7+