Using O, COc1ccc(-c2ccc(S(=O)(=O)NC3CC(CSCc4ccccc4)OC3=O)cc2)cc1 to produce COc1ccc(-c2ccc(S(=O)(=O)NC(CC(O)CSCc3ccccc3)C(=O)O)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.