Using CC1(C)CC(=O)Nc2c(Br)cc3c(c21)OC(CBr)C3, [N-]=[N+]=[N-] to produce CC1(C)CC(=O)Nc2c(Br)cc3c(c21)OC(CN=[N+]=[N-])C3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.