Using COC(=O)[C@H]1CC[C@H](C(=O)O)CC1, C[Si](C)(C)c1nccs1 to produce COC(=O)[C@H]1CC[C@H](C(=O)c2nccs2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.