Using Cc1ccc2c(c1)cc(C#N)n2C[C@@H](CO[Si](C)(C)C(C)(C)C)O[Si](C)(C)C(C)(C)C, O=C1CCC(=O)N1Br to produce CC(C)(C)[Si](C)(C)OC[C@H](Cn1c(C#N)cc2cc(CBr)ccc21)O[Si](C)(C)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.