Using COc1cc(C(F)(F)F)ccc1C(=O)O, ClC(Cl)(Br)C(Cl)(Cl)Br to produce COc1cc(C(F)(F)F)cc(Br)c1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.