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