InChI=1S/C21H16O11/c22-7-1-3-10-11(5-7)31-20(28)13-9-4-2-8(6-12(9)30-17(10)13)29-21-16(25)14(23)15(24)18(32-21)19(26)27/h1-6,14-16,18,21-25H,(H,26,27)