4-((2,4-Dihydroxy-5-((2-hydroxy-3,5-bis(hydroxy(oxido)amino)phenyl)diazenyl)-3-((4-(hydroxy(oxido)amino)phenyl)diazenyl)phenyl)diazenyl)-5-hydroxy-2,7-naphthalenedisulfonic acid 6637-87-2 AIDS-124728 AIDS124728 C.I. Acid Brown 75 NSC47740