Using NCCc1c[nH]c2ccc(Cl)cc12, O=C(Cl)c1cccc(CCl)c1 to produce O=C(NCCc1c[nH]c2ccc(Cl)cc12)c1cccc(CCl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.