InChI=1S/C21H20O10S/c1-21(2)18(31-32(25,26)27)8-14-17(30-21)9-16-13(19(14)28-3)7-12(20(24)29-16)11-5-4-10(22)6-15(11)23/h4-7,9,18,22-23H,8H2,1-3H3,(H,25,26,27)