Using C=CC[Si](CC=C)(CC=C)CCCc1ccc(CO)cc1, BrC(Br)(Br)Br to produce C=CC[Si](CC=C)(CC=C)CCCc1ccc(CBr)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.