InChI=1S/C24H20O9/c25-14-4-1-12(2-5-14)3-6-22(30)32-21-11-16-17(27)9-15(26)10-20(16)33-24(21)13-7-18(28)23(31)19(29)8-13/h1-10,21,24-29,31H,11H2/b6-3+/t21-,24-/m1/s1