Synonyms: disodium 4-amino-5-hydroxy-6-[[4'-[(4-hydroxyphenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-3-[(4-nitrophenyl)azo]naphthalene-2,7-disulphonate;4-Amino-5-hydroxy-6-((4'-((4-hydroxyphenyl)azo)-3,3'-dimethyl-(1,1'-biphenyl)-4-yl)azo)-3-((4-nitrophenyl)azo)- 2,7-naphthalenedisulfonic acid, disodium salt;2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-6-[[4'- [(4-hydroxyphenyl)azo]-3,3'-dimethyl[1,1'-biphenyl ]-4-yl]azo]-3-[(4-nitrophenyl)azo]-, disodium salt;4-Amino-5-hydroxy-6-[4'-(4-hydroxyphenylazo)-3,3'-dimethyl-4-biphenylylazo]-3-(4-nitrophenylazo)-2,7-naphthalenedisulfonic acid disodium salt;2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-6-(2-(4'-(2-(4-hydroxyphenyl)diazenyl)-3,3'-dimethyl(1,1'-biphenyl)-4-yl)diazenyl)-3-(2-(4-nitrophenyl)diazenyl)-, sodium salt (1:2);Disodium 4-amino-5-hydroxy-6-((4'-((4-hydroxyphenyl)azo)-3,3'-dimethyl(1,1'-biphenyl)-4-yl)azo)-3-((4-nitrophenyl)azo)naphthalene-2,7-disulphonate;Einecs 270-025-1