Using CCOC(=O)C1CC1C(=O)c1ccc2[nH]cc(C#N)c2c1 to produce CCOC(=O)C1CC1C(O)c1ccc2[nH]cc(C#N)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.