InChI=1S/C26H20O7/c1-11(2)13-8-14-22(29)21-16(28)9-17-12(6-7-26(3,4)33-17)24(21)32-25(14)20-15(27)10-18(31-5)23(30)19(13)20/h6-10,28H,1H2,2-5H3