Using CC(C)(C)C(=O)Nc1ccc(F)c(F)c1, CCOC(=O)c1ccc(F)cc1 to produce CC(C)(C)C(=O)Nc1ccc(F)c(F)c1C(=O)c1ccc(F)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.