Using COc1ccc(CN)cc1, O=[N+]([O-])c1cc(Br)c(CBr)c(Br)c1 to produce COc1ccc(CNCc2c(Br)cc([N+](=O)[O-])cc2Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.