Also Called: 2,7-Naphthalenedisulfonic acid, 5-amino-3-[[4-[[4-[(7-amino- 1-hydroxy-3-sulfo-2-naphthalenyl)azo]phenyl]azo ]phenyl]azo]-4-hydroxy-, trisodium salt;2,7-Naphthalenedisulfonic acid, 5-amino-3-[[4-[[4-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]phenyl]azo]phenyl]azo]-4-hydroxy-, trisodium salt;2,7-Naphthalenedisulfonic acid, 5-amino-3-[2-[4-[2-[4-[2-(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl]phenyl]diazenyl]phenyl]diazenyl]-4-hydroxy-, sodium salt (1:3)