Also Called: 1,6-Naphthalenedisulfonic acid, 4-amino-3-[[4'-[(1-amino-4-sulfo-2-naphthalenyl)azo]- 3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-, trisodium salt;1,6-Naphthalenedisulfonic acid, 4-amino-3-[2-[4'-[2-(1-amino-4-sulfo-2-naphthalenyl)diazenyl]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]diazenyl]-, sodium salt (1:3);1,6-Naphthalenedisulfonic acid, 4-amino-3-[[4'-[(1-amino-4-sulfo-2-naphthalenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-, trisodium salt;1,6-Naphthalenedisulfonic acid, 4-amino-3-((4'-((1-amino-4-sulfo-2-naphthalenyl)azo)-3,3'-dimethyl(1,1'-biphenyl)-4-yl)azo)-, trisodium salt