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