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