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