Using CC(=O)OC(C)=O, Nc1ccc2ccc(S(=O)(=O)O)cc2c1 to produce CC(=O)Nc1ccc2ccc(S(=O)(=O)[O-])cc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.