Using Nc1c(OC(F)(F)F)cc(Br)cc1[N+](=O)[O-], O=C([O-])[O-] to produce CNc1c(OC(F)(F)F)cc(Br)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.