Using Nc1ccc(S(=O)(=O)O)c2cccc(S(=O)(=O)O)c12 to produce Nc1ccc(S(=O)(=O)[O-])c2cccc(S(=O)(=O)[O-])c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.