Using O=C(O)C1(O)CC1, Nc1ccc(S(=O)(=O)c2ccccc2)cc1 to produce O=C(Nc1ccc(S(=O)(=O)c2ccccc2)cc1)C1(O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.