Using O=C(O)CCC(=O)c1ccc(-c2ccc(OC(F)(F)F)cc2)cc1, COC(C)(C)OC to produce COC(=O)CCC(=O)c1ccc(-c2ccc(OC(F)(F)F)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.