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