InChI=1S/C20H20O8S/c1-20(2)8-7-14-16(27-20)6-3-11-9-12(10-26-18(11)14)13-4-5-15(21)19(17(13)22)28-29(23,24)25/h3-8,12,21-22H,9-10H2,1-2H3,(H,23,24,25)