Using [N-]=[N+]=[N-], O=[N+]([O-])c1cnn(-c2c(Cl)cc(C(F)(F)F)c(Cl)c2Cl)c1Br to produce [N-]=[N+]=Nc1c([N+](=O)[O-])cnn1-c1c(Cl)cc(C(F)(F)F)c(Cl)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.