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