InChI=1S/C24H20O7/c1-10(25)16-17-13(24(4,5)31-22(17)28)8-12-19(27)18-14(26)9-15-11(20(18)29-21(12)16)6-7-23(2,3)30-15/h6-9,26H,1-5H3