InChI=1S/C33H28O18/c34-16-10-15-11-24(32(46)49-22(15)12-17(16)35)47-20-4-1-13(7-18(20)36)3-6-25(38)48-23(30(42)43)9-14-2-5-21(19(37)8-14)50-33-28(41)26(39)27(40)29(51-33)31(44)45/h1-8,10-12,23,26-29,33-37,39-41H,9H2,(H,42,43)(H,44,45)/b6-3+