InChI=1S/C20H16O10S/c1-20(9-29-31(25,26)27)5-4-12-16(30-20)7-15(23)17-18(24)13(8-28-19(12)17)11-3-2-10(21)6-14(11)22/h2-8,21-23H,9H2,1H3,(H,25,26,27)