Using C=C(O[Si](C)(C)C)C1CCN(C(=O)OC(C)(C)C)CC1, O=C1CCC(=O)N1Br to produce CC(C)(C)OC(=O)N1CCC(C(=O)CBr)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.