Using CN(C(=O)OC(C)(C)C)C1CCN(C(=O)OCc2cc(Cl)cc(Cl)c2)CC1 to produce CNC1CCN(C(=O)OCc2cc(Cl)cc(Cl)c2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.