5-acetamido-4-hydroxy-3-[[4-[methyl[[2-(sulphooxy)ethyl]sulphonyl]amino]phenyl]azo]naphthalene-2,7-disulphonic acid, potassium sodium salt

5-(Acetylamino)-4-hydroxy-3-[[4-[methyl[[2-(sulfooxy)ethyl]sulfonyl]amino]phenyl]azo]-2,7-naphthalenedisulfonic acid/sodium/potassium,(1:x:x) salt