Using Oc1ccc(F)cc1F, O=[N+]([O-])c1cnc(Cl)c(Br)c1 to produce O=[N+]([O-])c1cnc(Oc2ccc(F)cc2F)c(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.