Using Nc1ccc(Oc2cccc(Cl)c2)c(Cl)c1, O=C(Cl)c1ccccn1 to produce O=C(Nc1ccc(Oc2cccc(Cl)c2)c(Cl)c1)c1ccccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.