Using O=S([O-])[O-], O=C(OCc1ccccc1)[C@H](Cc1ccccc1)OC(=O)N1CCSC1 to produce O=C(OCc1ccccc1)[C@H](Cc1ccccc1)OC(=O)N1CCS(=O)(=O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.