Using Cc1ccc(N(C(=O)OC(C)(C)C)[Si](C)(C)C)cc1[Si](C)(C)C, O=C1CCC(=O)N1Br to produce CC(C)(C)OC(=O)N(c1ccc(CBr)c([Si](C)(C)C)c1)[Si](C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.