Using COc1cn(C(CC(C)(C)C)C(=O)OCc2ccccc2)c(=O)cc1-c1cc(Cl)ccc1C#N to produce COc1cn(C(CC(C)(C)C)C(=O)O)c(=O)cc1-c1cc(Cl)ccc1C#N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.