Using ClCc1ccccc1Cl, COC(=O)C1=Cc2cc(O)ccc2S(=O)(=O)CC1 to produce COC(=O)C1=Cc2cc(OCc3ccccc3Cl)ccc2S(=O)(=O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.