Using CC(=O)NCc1ccc(CC(=O)O)s1, CC(C)(C)OC(=O)N=[N+]=[N-] to produce CC(C)(C)OC(=O)NCc1ccc(CC(=O)O)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.