Using COC(=O)c1ccc(C(Br)Br)c(-c2cccc(C(F)(F)F)c2)c1, O to produce COC(=O)c1ccc(C=O)c(-c2cccc(C(F)(F)F)c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.