Using CN1CCN(C2CCN(C(=O)[C@H](NC(=O)OCc3ccccc3)C(C)(C)C)CC2)C(=O)C1 to produce CN1CCN(C2CCN(C(=O)[C@H](N)C(C)(C)C)CC2)C(=O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.