Using O=C(O)c1cc(C(F)(F)F)cc(C(F)(F)F)c1, C1CCOC1 to produce CC(=O)c1cc(C(F)(F)F)cc(C(F)(F)F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.