Using O=C(O)Cc1c[nH]c2cc(Cl)c(Cl)cc12, C=CC(=O)N1CC(N2CCNCC2)C1 to produce C=CC(=O)N1CC(N2CCN(C(=O)Cc3c[nH]c4cc(Cl)c(Cl)cc34)CC2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.