Synonyms: Benzenesulfonic acid, 4-(2-(4-(2-(4-(diethylamino)phenyl)diazenyl)phenyl)diazenyl)-, compd. with 2,2',2''-nitrilotris(ethanol) (1:1);Benzenesulfonic acid, 4-((4-((4-(diethylamino)phenyl)azo)phenyl)azo)-, compd. with 2,2',2''-nitrilotris(ethanol) (1:1);p-((p-((p-(Diethylamino)phenyl)azo)phenyl)azo)benzenesulphonic acid, compound with 2,2',2''-nitrilotriethanol (1:1);4-[(E)-(4-{(E)-[4-(diethylamino)phenyl]diazenyl}phenyl)diazenyl]benzenesulfonic acid - 2,2',2''-nitrilotriethanol (1:1)