InChI=1S/C27H24N2O5/c1-33-21-15-25(34-26(31)16-21)23(13-19-10-6-3-7-11-19)29-17-22(27(28)32)24(30)14-20(29)12-18-8-4-2-5-9-18/h2-11,14-17,23H,12-13H2,1H3,(H2,28,32)/t23-/m0/s1