Using O=C(O)c1cccc(Cl)c1, NCCNc1nc(Cl)nc2c1ncn2C1CCCC1 to produce O=C(NCCNc1nc(Cl)nc2c1ncn2C1CCCC1)c1cccc(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.