Using COC(=O)C(c1ccccc1)N1C(=O)C(NC(=O)Cc2ccccc2)C1SC to produce COC(=O)C(c1ccccc1)N1CC(NC(=O)Cc2ccccc2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.