InChI=1S/C21H20O11/c22-7-14(27)20-18(28)19(29)21(32-20)30-9-4-12(25)17-13(26)6-15(31-16(17)5-9)8-1-2-10(23)11(24)3-8/h1-6,14,18-25,27-29H,7H2