Also Called: 2,7-Naphthalenedisulfonic acid, 3-[[3,3'-dimethyl-4'-[[4-[[(4-methylphenyl)sulfonyl]oxy] phenyl] azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-5-[[(4-methylphenyl) sulfonyl]oxy]-, disodium salt;2,7-Naphthalenedisulfonic acid, 3-[2-[3,3'-dimethyl-4'-[2-[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]diazenyl][1,1'-biphenyl]-4-yl]diazenyl]-4-hydroxy-5-[[(4-methylphenyl)sulfonyl]oxy]-, sodium salt (1:2);2,7-Naphthalenedisulfonic acid, 3-[[3,3'-dimethyl-4'-[[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-5-[[(4-methylphenyl)sulfonyl]oxy]-, disodium salt;Disodium 3-[[3,3'-dimethyl-4'-[[4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-5-[[(p-tolyl)sulphonyl]oxy]naphthalene-2,7-disulphonate