Using [N-]=[N+]=[N-], C[C@]12CCC(=O)C=C1C(Br)C[C@@H]1[C@@H]2CC[C@]2(C)C(=O)CC[C@@H]12 to produce C[C@]12CCC(=O)C(N)=C1C=C[C@@H]1[C@@H]2CC[C@]2(C)C(=O)CC[C@@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.