4-(Benzoylamino)-5-hydroxy-6-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-1,7-naphthalenedisulfonic acid

4-(benzoylamino)-5-hydroxy-6-[[4-[[2-(sulphooxy)ethyl]sulphonyl]phenyl]azo]naphthalene-1,7-disulphonic acid