Synonyms: 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-(2-(4-(2-phenyldiazenyl)phenyl)diazenyl)-, compd. with 2-ethyl-N-(2-ethylhexyl)-1-hexanamine (1:2);1-((4-(Phenylazo)phenyl)azo)-2-hydroxy-6,8-naphthalenedisulfonic acid, di(2-ethylhexyl)ammonium salt (1:2);1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-((4-(phenylazo)phenyl)azo)-, compd. with 2-ethyl-N-(2-ethylhexyl)-1-hexanamine (1:2);7-Hydroxy-8-((4-(phenylazo)phenyl)azo)naphthalene-1,3-disulphonic acid, compound with 2-ethyl-N-(2-ethylhexyl)hexylamine (1:2);(8Z)-7-oxo-8-(2-{4-[(E)-phenyldiazenyl]phenyl}hydrazinylidene)-7,8-dihydronaphthalene-1,3-disulfonic acid - 2-ethyl-N-(2-ethylhexyl)hexan-1-amine (1:2)