1,3-Naphthalenedisulfonic acid, 4-amino-6-((4'-((8-amino-1-hydroxy-3,6-disulfo-2-naphthalenyl)azo)-3,3'-dimethoxy(1,1'-biphenyl)-4-yl)azo)-5-hydroxy-, tetrasodium salt 2,7-Naphthalenedisulfonic acid, 5-amino-3-((4'-((4-amino-5-hydroxy-1,3-disulfo-6-naphthalenyl)azo))((3,3'-dimethoxy)(1,1'-biphenyl)-4-yl)azo)-4-hydroxy-, tetrasodium salt 3443-04-7