Using O=C(CS(=O)(=O)c1ccc(=O)[nH]n1)c1ccc(Cl)cc1 to produce O=c1ccc(S(=O)(=O)CC(O)c2ccc(Cl)cc2)n[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.