Using COC(=O)c1cc(C(=O)OC)n(CCCBr)n1, [N-]=[N+]=[N-] to produce COC(=O)c1cc(C(=O)OC)n(CCCN=[N+]=[N-])n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.