Using O=C([O-])[O-], CC(C)(C)OC(=O)N1CC(=O)C(C#N)C1 to produce CC(C)(C)OC(=O)N1CC(=O)C(C)(C#N)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.