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