Using COC(=O)c1cnc(-c2ccc(OC(F)(F)F)cc2)cc1C(F)(F)F to produce OCc1cnc(-c2ccc(OC(F)(F)F)cc2)cc1C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.