Using CCOC(=O)c1cc(=O)c2cc(Br)cc([N+](=O)[O-])c2o1 to produce CCOC(=O)c1cc(=O)c2cccc([N+](=O)[O-])c2o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.