Using BrC(Br)(Br)Br, CC[Si](CC)(CC)c1[nH]c2cc(Cl)c(C)cc2c1CCO to produce CC[Si](CC)(CC)c1[nH]c2cc(Cl)c(C)cc2c1CCBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.