InChI=1S/C25H18O8/c1-30-20-7-13(8-21(31-2)24(20)29)25-23(28)16-11-17(12-3-5-14(26)6-4-12)32-18-9-15(27)10-19(33-25)22(16)18/h3-11H,1-2H3,(H3-,26,27,28,29)/p+1