Using CCOC(=O)c1cc(S(=O)(=O)Nc2ccccc2F)c(F)cc1Cl to produce O=C(O)c1cc(S(=O)(=O)Nc2ccccc2F)c(F)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.