5-(benzoylamino)-3-[[3-[4-(tert-butyl)phenoxy]phenyl]azo]-4-hydroxynaphthalene-2,7-disulphonic acid

5-(Benzoylamino)-3-[[3-[4-(1,1-dimethylethyl)phenoxy]phenyl]azo]-4-hydroxy-2,7-naphthalenedisulfonic acid