Using O=C(O)c1cccs1, COC(=O)[C@@H]1C[C@H](N)[C@@H](O)C1 to produce COC(=O)[C@@H]1C[C@H](NC(=O)c2cccs2)[C@@H](O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.