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