Using COc1ccc(C=O)cc1O[Si](C(C)C)(C(C)C)C(C)C, BrBr to produce COc1cc(Br)c(C=O)cc1O[Si](C(C)C)(C(C)C)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.