Using CN1C(=O)Nc2ccc(Br)cc2S1(=O)=O, C[Si](C)(C)CCOCCl to produce CN1C(=O)N(COCC[Si](C)(C)C)c2ccc(Br)cc2S1(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.