InChI=1S/C20H24O7S/c1-26-18(14-20(22)19(21)13-16-5-3-2-4-6-16)12-9-15-7-10-17(11-8-15)27-28(23,24)25/h2-8,10-11,18-19,21H,9,12-14H2,1H3,(H,23,24,25)