Using [N-]=[N+]=[N-], CC(C)(C)OC(=O)n1cnc2c(CBr)cccc21 to produce CC(C)(C)OC(=O)n1cnc2c(CN=[N+]=[N-])cccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.