Using Cc1cc(Br)ccc1[C@H](COCc1ccccc1)COS(C)(=O)=O, [F-] to produce Cc1cc(Br)ccc1[C@@H](CF)COCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.