InChI=1S/C33H30O18/c34-17-5-1-15(10-19(17)36)12-24(31(44)45)49-25(38)8-4-14-3-7-21(20(37)9-14)48-23(30(42)43)13-16-2-6-18(35)22(11-16)50-33-28(41)26(39)27(40)29(51-33)32(46)47/h1-11,13,24,26-29,33-37,39-41H,12H2,(H,42,43)(H,44,45)(H,46,47)/b8-4+,23-13-