Using COC(=O)CCSc1ccc(Cl)cc1NS(=O)(=O)c1ccc(Cl)cc1F to produce O=C(O)CCSc1ccc(Cl)cc1NS(=O)(=O)c1ccc(Cl)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.