Using CC(=O)Nc1c(Br)cc2c(c1[N+](=O)[O-])CC(NC(C)=O)C2 to produce CC(=O)NC1Cc2cc(Br)c(N)c([N+](=O)[O-])c2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.