Using CC[Si](CC)(CC)c1[nH]c2ncc(Cl)cc2c1CCO, BrC(Br)(Br)Br to produce CC[Si](CC)(CC)c1[nH]c2ncc(Cl)cc2c1CCBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.