Synonyms: 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-(2-(4-(2-phenyldiazenyl)phenyl)diazenyl)-, compd. with N-octyl-1-octanamine (1:2);3,6-Naphthalenedisulfonic acid, 7-hydroxy-8-((4-(phenylazo)phenyl)azo)-, dioctylamine salt (1:2);2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-((4-(phenylazo)phenyl)azo)-, compd. with N-octyl-1-octanamine (1:2);3-Hydroxy-4-((4-(phenylazo)phenyl)azo)naphthalene-2,7-disulphonic acid, compound with dioctylamine (1:2);(4Z)-3-oxo-4-(2-{4-[(E)-phenyldiazenyl]phenyl}hydrazinylidene)-3,4-dihydronaphthalene-2,7-disulfonic acid - N-octyloctan-1-amine (1:2)