Using COc1ccc(-c2c(C(O)C(F)(F)F)n(Cc3cccc(C(F)(F)F)c3)c3ccccc23)cc1 to produce COc1ccc(-c2c(C(=O)C(F)(F)F)n(Cc3cccc(C(F)(F)F)c3)c3ccccc23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.