Using Cc1cc(C)cc(OCCO[Si](C)(C)C(C)(C)C)c1, O=C1CCC(=O)N1Br to produce Cc1cc(CBr)cc(OCCO[Si](C)(C)C(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.