Using CCOC(=O)C1=CCCCC1S(=O)(=O)Nc1ccc(Cl)cc1F to produce COC(=O)C1=CCCCC1S(=O)(=O)Nc1ccc(Cl)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.