Using COc1ccc(O)cc1Cc1ccc(=O)[nH]n1, O=Cc1cc(Br)c(O)c([N+](=O)[O-])c1 to produce COc1ccc(Oc2c(Br)cc(C=O)cc2[N+](=O)[O-])cc1Cc1ccc(=O)[nH]n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.