Using O=CCN1C(=O)c2ccccc2C1=O, CC(C)(C)OC(=O)[C@@H](N)C(C)(C)C to produce CC(C)(C)OC(=O)[C@@H](NCCN1C(=O)c2ccccc2C1=O)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.