Using O=C1CCC(=O)N1Br, Cc1cc(O[Si](c2ccccc2)(c2ccccc2)C(C)(C)C)ccc1Cl to produce CC(C)(C)[Si](Oc1ccc(Cl)c(CBr)c1)(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.