Using COC(=O)c1ccc(S(=O)(=O)NC(=O)OCc2ccccc2)cc1 to produce O=C(NS(=O)(=O)c1ccc(C(=O)O)cc1)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.