InChI=1S/C20H18O13/c1-2-7-10(12(22)9-6(21)4-3-5-8(9)31-7)11(17(26)27)19(30)33-20-15(25)13(23)14(24)16(32-20)18(28)29/h2-5,11,13-16,20-21,23-25H,1H2,(H,26,27)(H,28,29)