Using CCOC(=O)c1cc(C#N)c2c(c1)C(C)(C)CC(C)(C)O2 to produce CC1(C)CC(C)(C)c2cc(C(=O)O)cc(C#N)c2O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.