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