[Eu].COc1ccccc1C(=O)CC(=O)C(F)(F)F.COc2ccccc2C(=O)CC(=O)C(F)(F)F.COc3ccccc3C(=O)CC(=O)C(F)(F)F.COc4ccccc4C(=O)CC(=O)C(F)(F)F.N5CCCCC5