InChI=1S/C25H18O9/c1-31-20-6-12(7-21(32-2)24(20)30)25-23(29)14-10-17(11-3-4-15(27)16(28)5-11)33-18-8-13(26)9-19(34-25)22(14)18/h3-10H,1-2H3,(H4-,26,27,28,29,30)/p+1