Using NS(=O)(=O)c1ccccc1, Cc1cc(C(=O)O)cc(C)c1C(=O)O to produce Cc1cc(C(=O)NS(=O)(=O)c2ccccc2)cc(C)c1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.