Using BrC(Br)(Br)Br, COC1(c2ccc(C(F)(F)F)cc2CO)CCCC1 to produce COC1(c2ccc(C(F)(F)F)cc2CBr)CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.