InChI=1S/C20H18O14/c1-2-7-10(12(23)9-6(22)3-5(21)4-8(9)32-7)11(17(27)28)19(31)34-20-15(26)13(24)14(25)16(33-20)18(29)30/h2-4,11,13-16,20-22,24-26H,1H2,(H,27,28)(H,29,30)