Using O=c1cc(-c2ccc([N+](=O)[O-])cc2)oc2ccc(Br)cc12 to produce Nc1ccc(-c2cc(=O)c3cc(Br)ccc3o2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.