Using CCOC(=O)C1CCN(C(=O)OC(C)(C)C)CC1c1ccc(F)c(F)c1 to produce COC(=O)C1CCN(C(=O)OC(C)(C)C)CC1c1ccc(F)c(F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.