Using O=C([O-])[O-], NC(=O)[C@H](c1ccccc1Cl)N1CCc2sccc2C1 to produce COC(=O)[C@H](c1ccccc1Cl)N1CCc2sccc2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.