InChI=1S/C19H26O7S/c1-4-19(25-17(3)20)15-11-10-14-18(21)13-9-7-5-6-8-12-16(2)26-27(22,23)24/h4,9,13,16,18-19,21H,1,5-8,12H2,2-3H3,(H,22,23,24)/b13-9+