Using O=[N+]([O-])c1ccc(O)cc1F, CCOC(=O)C(C)(C)Br to produce CCOC(=O)C(C)(C)Oc1ccc([N+](=O)[O-])c(F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.