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