InChI=1S/C20H18O11/c21-11-7-3-1-5-9(11)18(27)29-12-8-4-2-6-10(12)19(28)31-20-15(24)13(22)14(23)16(30-20)17(25)26/h1-8,13-16,20-24H,(H,25,26)