Using C#C[Si](C(C)C)(C(C)C)C(C)C, Brc1ccc(I)cc1 to produce CC(C)[Si](C#Cc1ccc(Br)cc1)(C(C)C)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.