Using COC(=O)c1ccc2ccccc2c1OCc1ccc(C(F)(F)F)cc1 to produce O=C(O)c1ccc2ccccc2c1OCc1ccc(C(F)(F)F)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.