Using C[Si](C)(C)CCOCn1ncc2cc(C(F)(F)F)cc(CO)c21, BrC(Br)(Br)Br to produce C[Si](C)(C)CCOCn1ncc2cc(C(F)(F)F)cc(CBr)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.