Using CC(C)(C)C(=O)Nc1ccc(Cl)cc1F, CCOC(=O)C(F)(F)F to produce CC(C)(C)C(=O)Nc1c(F)cc(Cl)cc1C(=O)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.