Using CC(=O)Br, O=[N+]([O-])c1cc(CC(F)(F)F)[n+]([O-])c(CC(F)(F)F)c1 to produce [O-][n+]1c(CC(F)(F)F)cc(Br)cc1CC(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.