Using O=[N+]([O-])c1ccccc1Br, O=[N+]([O-])c1cc(Br)ccc1Br to produce O=[N+]([O-])c1ccccc1-c1ccc(Br)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.