Using O=S(Cl)Cl, C[Si](C)(C)C1=C2c3nc4ccccc4cc3C(O)CC2CC1=O to produce C[Si](C)(C)C1=C2c3nc4ccccc4cc3C(Cl)CC2CC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.