Using NCCc1ccc(-c2ccc(Cl)c(Cl)c2)o1, O=C(O)c1n[nH]c2ccccc12 to produce O=C(NCCc1ccc(-c2ccc(Cl)c(Cl)c2)o1)c1n[nH]c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.