InChI=1S/C35H28O15/c36-17-6-4-15(5-7-17)31-35(25-16(10-18(37)11-23(25)49-34(35)46)3-1-14-2-8-20(38)21(39)9-14)26-22(40)12-19(13-24(26)48-31)47-33-29(43)27(41)28(42)30(50-33)32(44)45/h1-13,27-31,33,36-43H,(H,44,45)/b3-1+