Using O=[N+]([O-])Nc1cc(Br)nc(Br)c1, Nc1cccnc1[N+](=O)[O-] to produce Nc1cc(Br)nc(Br)c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.