Using CC1(C)OCC[C@@H]2[C@H](N=[N+]=[N-])C(=O)N21, CC(C)=O to produce COC(=O)C[C@@H]1NC(=O)[C@H]1N=[N+]=[N-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.