4-(benzoylamino)-5-hydroxy-6-[[1-sulpho-6-[[2-(sulphooxy)ethyl]sulphonyl]-2-naphthyl]azo]naphthalene-1,7-disulphonic acid, potassium sodium salt

4-(Benzoylamino)-5-hydroxy-6-[[1-sulfo-6-[[2-(sulfooxy)ethyl]sulfonyl]-2-naphthalenyl]azo]-1,7-naphthalenedisulfonic acid/potassium/sodium,(1:x:x) salt