Synonyms: 4-[[7-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sulphonato-2-naphthyl]azo]-4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-2,2'-disulphonic acid;4-[[7-[(2,4-Diaminophenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-4'-[(4-hydroxyphenyl)azo]-1,1'-biphenyl-2,2'-disulfonic acid;4-((7-((2,4-Diaminophenyl)azo)-1-hydroxy-3-sulphonato-2-naphthyl)azo)-4'-((4-hydroxyphenyl)azo)(1,1'-biphenyl)-2,2'-disulphonic acid;Einecs 289-030-5