Using C[Si](C)(C)CCOCn1cc(-c2ccncn2)nc1C1CC1, BrBr to produce C[Si](C)(C)CCOCn1c(C2CC2)nc(-c2ccncn2)c1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.