(1,1'-Biphenyl)-3-sulfonic acid, 4,4'-diamino- 2051-89-0 4,4'-Diamino(1,1'-biphenyl)-3-sulphonic acid 4-14-00-02806 (Beilstein Handbook Reference) 4:4'-Diamino-3-diphenylyl hydrogen sulfate BIPHENYL-3-SULFONIC ACID, 4,4'-DIAMINO- BRN 3532578 Benzidine, 3-sulfo- Benzidine-3-sulfuric acid Benzidine-3-sulphuric acid EINECS 218-132-4