Using Clc1cc(Cl)ncn1, CC(C)(C)OC(=O)N1CCN(C(=O)C2CCNCC2)CC1 to produce CC(C)(C)OC(=O)N1CCN(C(=O)C2CCN(c3cc(Cl)ncn3)CC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.