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