Using [N-]=[N+]=[N-], Cc1cc2c(c3c1NC(=O)C(C)(C)C3)OC(C)(CBr)C2 to produce Cc1cc2c(c3c1NC(=O)C(C)(C)C3)OC(C)(CN=[N+]=[N-])C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.