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