Using CCOC(=O)c1ccc(C(=O)CBr)cc1, [N-]=[N+]=[N-] to produce CCOC(=O)c1ccc(C(=O)CN=[N+]=[N-])cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.