Using O=[N+]([O-])c1cc([N+](=O)[O-])cc(S(=O)(=O)NCCCNc2nc(Cl)ncc2Br)c1 to produce Nc1cc([N+](=O)[O-])cc(S(=O)(=O)NCCCNc2nc(Cl)ncc2Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.