Using C[Si](C)(C)CCOCCl, CC1(C)C(=O)Nc2cc(Br)ccc21 to produce CC1(C)C(=O)N(COCC[Si](C)(C)C)c2cc(Br)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.