Using CC(C)N1CCN(C(=O)OC(C)(C)C)[C@@H](C(=O)N2CCN(C(=O)OCc3ccccc3)CC2)C1 to produce CC(C)N1CCN(C(=O)OC(C)(C)C)[C@@H](C(=O)N2CCNCC2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.