InChI=1S/C21H18O9/c22-12-9-15(28-13-7-3-1-5-10(12)13)11-6-2-4-8-14(11)29-21-18(25)16(23)17(24)19(30-21)20(26)27/h1-9,16-19,21,23-25H,(H,26,27)