Using COc1cc(C(O)c2cc(F)cc(OC(F)(F)C(F)F)c2)ccc1F to produce COc1cc(C(=O)c2cc(F)cc(OC(F)(F)C(F)F)c2)ccc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.