Using NCC1=C(CC(=O)O)CC=CC1, CC(C)(C)OC(=O)N=[N+]=[N-] to produce CC(C)(C)OC(=O)NCC1=C(CC(=O)O)CC=CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.