Using C[C@H](c1ccccc1)N1C[C@@](CCBr)(C(=O)OC(C)(C)C)C(F)C1=O to produce C[C@H](c1ccccc1)N1C[C@]2(C(=O)OC(C)(C)C)CC[C@]2(F)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.