InChI=1S/C24H20O10/c25-13-8-16(27)14-10-21(33-22(31)4-2-11-1-3-15(26)17(28)5-11)24(34-20(14)9-13)12-6-18(29)23(32)19(30)7-12/h1-9,21,24-30,32H,10H2/b4-2+/t21-,24-/m1/s1