Using CC(C)(C)C(=O)Nc1c(-c2ncccn2)cc(Br)cc1[N+](=O)[O-] to produce Nc1c(-c2ncccn2)cc(Br)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.