InChI=1S/C35H28O15/c36-17-6-4-15(5-7-17)31-35(26-22(40)11-19(38)12-23(26)48-31)25-16(2-1-14-3-8-18(37)10-21(14)39)9-20(13-24(25)49-34(35)46)47-33-29(43)27(41)28(42)30(50-33)32(44)45/h1-13,27-31,33,36-43H,(H,44,45)/b2-1+