InChI=1S/C21H20O11/c22-7-16-18(27)19(28)20(29)21(32-16)31-14-3-8(1-2-10(14)24)13-6-12(26)17-11(25)4-9(23)5-15(17)30-13/h1-6,16,18-25,27-29H,7H2/t16-,18-,19+,20-,21-/m1/s1