Using O=C(Nc1ccc(Br)c(C(F)(F)F)c1)c1ccccc1[N+](=O)[O-] to produce Nc1ccccc1C(=O)Nc1ccc(Br)c(C(F)(F)F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.