Using CC(C)(C)OC(=O)N[C@H]1CCN(C2CCN(C(=O)OCc3ccccc3)CC2)C1=O to produce CC(C)(C)OC(=O)N[C@H]1CCN(C2CCNCC2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.