Using O=C(O)CN1CCOCC1, CC(C)C[C@H](NC(=O)[C@@H](N)CCc1ccccc1)C(=O)OCc1ccccc1 to produce CC(C)C[C@H](NC(=O)[C@H](CCc1ccccc1)NC(=O)CN1CCOCC1)C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.