InChI=1S/C21H20O11/c22-7-16-18(27)19(28)20(29)21(32-16)30-9-1-2-10-11(23)6-14(31-15(10)5-9)8-3-12(24)17(26)13(25)4-8/h1-6,16,18-22,24-29H,7H2/t16-,18-,19+,20-,21-/m1/s1