Using CC1(C)OC(=O)CC(=O)O1, O=C(OCc1ccccc1)C1CC(F)(F)C1 to produce CC1(C)OC(=O)C(C(=O)C2CC(F)(F)C2)C(=O)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.