InChI=1S/C33H25N3O3/c37-31-28-22-19-23(33(39,21-13-5-2-6-14-21)25-16-8-10-18-35-25)29(30(28)32(38)36-31)27(22)26(20-11-3-1-4-12-20)24-15-7-9-17-34-24/h1-19,22,28-30,39H,(H,36,37,38)/b27-26+