4-Hydrazinobenzenesulfonic acid 4-Sulfophenylhydrazine 98-71-5 Benzenesulfonic acid, 4-hydrazino- Benzenesulfonic acid, p-hydrazino- NSC1608 Phenylhydrazine-4-sulfonic acid Phenylhydrazine-p-sulfonic acid Phenylhydrazinesulfonic acid Sulfanilic acid, N-amino- p-Hydrazinobenzenesulfonic acid p-Hydrazinophenylsulfonic acid p-Phenylhydrazinesulfonic acid p-Sulfophenylhydrazine