Also Called: 2,7-Naphthalenedisulfonic acid, 5-amino-3-[[4-[[4-[(8-amino- 1-hydroxy-3,6-disulfo-2-naphthalenyl)azo]-3-methoxyphenyl ]azo]phenyl]azo]-4-hydroxy-, tetrasodium salt;2,7-Naphthalenedisulfonic acid, 5-amino-3-[2-[4-[2-[4-[2-(8-amino-1-hydroxy-3,6-disulfo-2-naphthalenyl)diazenyl]-3-methoxyphenyl]diazenyl]phenyl]diazenyl]-4-hydroxy-, sodium salt (1:4);2,7-Naphthalenedisulfonic acid, 5-amino-3-[[4-[[4-[(8-amino-1-hydroxy-3,6-disulfo-2-naphthalenyl)azo]-3-methoxyphenyl]azo]phenyl]azo]-4-hydroxy-, tetrasodium salt