3-Pyridinamine, 6-((4-aminophenyl)sulfonyl)- 4-22-00-05597 (Beilstein Handbook Reference) 5-Aminopyridyl-4'-aminophenylsulfone 5401-26-3 6-((4-Aminophenyl)sulfonyl)-3-pyridinamine BRN 0195792 NSC 3619 Pyridinin Pyridinine