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