Using O=C1CCC(=O)N1Br, O=[N+]([O-])c1ccccc1N1CCCc2ccccc21 to produce O=[N+]([O-])c1ccccc1N1CCCc2cc(Br)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.