Using CCOC(=O)c1ccc(-c2cc(C(F)(F)F)cc(C(F)(F)F)c2)o1 to produce O=C(O)c1ccc(-c2cc(C(F)(F)F)cc(C(F)(F)F)c2)o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.