Using Cc1c(Cl)ccc([N+](=O)[O-])c1Cl, O=C1NC(=O)C(Br)(Br)N1 to produce O=[N+]([O-])c1ccc(Cl)c(CBr)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.