Using COC(=O)C1CCN(c2ccc(N)cc2C(F)(F)F)CC1, O=[N+]([O-])c1cnc2ccc(Br)cc2c1Cl to produce COC(=O)C1CCN(c2ccc(Nc3c([N+](=O)[O-])cnc4ccc(Br)cc34)cc2C(F)(F)F)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.