Using O=C(Cl)c1ccc(Cl)c([N+](=O)[O-])c1, Nc1ncc(Br)s1 to produce O=C(Nc1ncc(Br)s1)c1ccc(Cl)c([N+](=O)[O-])c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.