InChI=1S/C20H18O10S/c1-20(2)15(30-31(25,26)27)6-10-5-9(3-4-13(10)29-20)19-18(24)17(23)16-12(22)7-11(21)8-14(16)28-19/h3-5,7-8,15,21-22,24H,6H2,1-2H3,(H,25,26,27)