Using CCC(C)c1ccc(S(=O)(=O)Nc2ccsc2C(=O)OC)cc1 to produce CCC(C)c1ccc(S(=O)(=O)Nc2ccsc2C(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.