Using CC(C)(C)OC(=O)N1CCCC(C(=O)O)C1, O=C(Nc1ccc(Cl)c(Cl)c1)N1CCNCC1 to produce CC(C)(C)OC(=O)N1CCCC(C(=O)N2CCN(C(=O)Nc3ccc(Cl)c(Cl)c3)CC2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.