Using Nc1ccnn1-c1c(Cl)cc(C(F)(F)F)c(Cl)c1Cl, O=C(Cl)C(Cl)Cl to produce O=C(Nc1ccnn1-c1c(Cl)cc(C(F)(F)F)c(Cl)c1Cl)C(Cl)Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.