Using CCCCc1ccc(S(=O)(=O)Nc2ccsc2C(=O)OC)c(Cl)c1 to produce CCCCc1ccc(S(=O)(=O)Nc2ccsc2C(=O)O)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.