Using CC(C)(C)[Si](OCC#CCCO)(c1ccccc1)c1ccccc1, BrC(Br)(Br)Br to produce CC(C)(C)[Si](OCC#CCCBr)(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.