Using CC(C)N1CCN(C(=O)C2CCN(C(=O)OC(C)(C)C)CC2)[C@@H](C)C1 to produce CC(C)N1CCN(C(=O)C2CCNCC2)[C@@H](C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.