Using Nc1c(Cl)cc(C(F)(C(F)(F)F)C(F)(F)F)cc1Br, O=C(Cl)c1cccc([N+](=O)[O-])c1F to produce O=C(Nc1c(Cl)cc(C(F)(C(F)(F)F)C(F)(F)F)cc1Br)c1cccc([N+](=O)[O-])c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.