Synonyms: 2,7-Naphthalenedisulfonic acid, 5-(acetylamino)-3-(2-(4-((3-(((4-(2,4-bis(1,1-dimethylpropyl)phenoxy)butyl)amino)carbonyl)-4-hydroxy-1-naphthalenyl)oxy)phenyl)diazenyl)-4-hydroxy-, compd. with pyridine (1:2);2,7-Naphthalenedisulfonic acid, 5-(acetylamino)-3-((4-((3-(((4-(2,4-bis(1,1-dimethylpropyl)phenoxy)butyl)amino)carbonyl)-4-hydroxy-1-naphthalenyl)oxy)phenyl)azo)-4-hydroxy-, compd. with pyridine (1:2);5-Acetamido-3-((4-((3-(((4-(2,4-di(tert-pentyl)phenoxy)butyl)amino)carbonyl)-4-hydroxy-1-naphthyl)oxy)phenyl)azo)-4-hydroxynaphthalene-2,7-disulphonic acid, compound with pyridine (1:2);(3E)-5-(acetylamino)-3-[2-(4-{[3-({4-[2,4-bis(2-methylbutan-2-yl)phenoxy]butyl}carbamoyl)-4-hydroxynaphthalen-1-yl]oxy}phenyl)hydrazinylidene]-4-oxo-3,4-dihydronaphthalene-2,7-disulfonic acid - pyridine (1:2)