InChI=1S/C20H20O8S/c1-11(9-27-29(23,24)25)2-4-14-17(22)7-6-13-16-10-26-18-8-12(21)3-5-15(18)20(16)28-19(13)14/h2-3,5-8,16,20-22H,4,9-10H2,1H3,(H,23,24,25)