InChI=1S/C20H18O11/c1-28-8-5-11-13(14(22)9-4-7(21)2-3-10(9)29-11)12(6-8)30-20-17(25)15(23)16(24)18(31-20)19(26)27/h2-6,15-18,20-21,23-25H,1H3,(H,26,27)