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