InChI=1S/C20H18O12S/c1-28-13-8-10(3-5-11(13)21)17-20(24)15(18(22)31-17)16(30-19(20)23)9-4-6-12(14(7-9)29-2)32-33(25,26)27/h3-8,15-17,21,24H,1-2H3,(H,25,26,27)