InChI=1S/C18H26O8S/c1-13(2)7-9-15(26-27(21,22)23)5-4-6-18(20)25-12-14-8-10-16(19)17(11-14)24-3/h7-11,13,15,19H,4-6,12H2,1-3H3,(H,21,22,23)/b9-7+