Using Br, CS(=O)(=O)c1ccc(CC(=O)c2ccc(F)cc2)cc1 to produce CS(=O)(=O)c1ccc(C(Br)C(=O)c2ccc(F)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.