InChI=1S/C19H26O7S/c1-4-6-7-8-11-17(21)14-15-19(26-27(22,23)24)13-10-9-12-18(5-2)25-16(3)20/h5,14-15,17-19,21H,2,4,6-8,11H2,1,3H3,(H,22,23,24)/b15-14+