Using CC(C)(C)C(C[C@H](N)C(=O)O)C(=O)O, O=C1CCCCCCC1 to produce CC(C)(C)C(C[C@H](NC1CCCCCCC1)C(=O)O)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.