InChI=1S/C36H30O15/c1-47-30-21(40)9-15(10-24(30)49-34-29(43)27(41)28(42)31(51-34)33(44)45)7-8-17-11-18(37)13-22-25(17)36(35(46)50-22)26-20(39)12-19(38)14-23(26)48-32(36)16-5-3-2-4-6-16/h2-14,27-29,31-32,34,37-43H,1H3,(H,44,45)/b8-7+