Using BrC(Br)(Br)Br, CC(C)[Si](Oc1c(F)cc(CO)cc1F)(C(C)C)C(C)C to produce CC(C)[Si](Oc1c(F)cc(CBr)cc1F)(C(C)C)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.