Using COC(=O)CCC(C#N)(CCC(=O)OC)c1ccc(OC)c2c1OC(C)(C)O2 to produce COC(=O)C1CC(C#N)(c2ccc(OC)c3c2OC(C)(C)O3)CCC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.