InChI=1S/C19H26O7S/c1-3-19(26-17(2)20)15-11-10-14-18(21)13-9-7-5-4-6-8-12-16-25-27(22,23)24/h3,9,13,18-19,21H,1,4-8,12,16H2,2H3,(H,22,23,24)/b13-9+