Using CCOC(=O)C(Cc1ccc(C(F)(F)F)cc1)C(O)c1ccccc1 to produce O=C(O)C(Cc1ccc(C(F)(F)F)cc1)C(O)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.