Using CCOC(=O)C(=O)N1CCc2cc(Br)ccc21, CC(C)O[N+](=O)[O-] to produce CCOC(=O)C(=O)N1CCc2cc(Br)cc([N+](=O)[O-])c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.