Using O=S([O-])OO, CCc1ccc(-c2ccc(Cl)cc2Cl)cc1C1C(=O)C(C)(C)SC(C)(C)C1=O to produce CCc1ccc(-c2ccc(Cl)cc2Cl)cc1C1C(=O)C(C)(C)S(=O)(=O)C(C)(C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.