Using O=S(Cl)Cl, C[Si](C)(C)CCOCN1C(=O)CCCc2cccc(CO)c21 to produce C[Si](C)(C)CCOCN1C(=O)CCCc2cccc(CCl)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.