InChI=1S/C18H26O8S/c1-13(2)8-6-4-5-7-9-17(20)25-12-14-10-15(19)18(16(11-14)24-3)26-27(21,22)23/h6,8,10-11,13,19H,4-5,7,9,12H2,1-3H3,(H,21,22,23)/b8-6+