InChI=1S/C19H26O7S/c1-3-4-5-6-7-8-9-12-17(26-27(21,22)23)13-10-11-14-18(19-15-24-19)25-16(2)20/h9,12,17-19H,3-8,15H2,1-2H3,(H,21,22,23)/b12-9+