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