Using Cc1cccc(C(F)(F)C(F)(F)c2ccccc2)c1C, O=C1CCC(=O)N1Br to produce Cc1c(CBr)cccc1C(F)(F)C(F)(F)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.