4-[[3-[[(1,1-dimethylethyl)amino]sulphonyl]-4-hydroxy-8-[(methylsulphonyl)amino]-1-naphthyl]azo]benzenesulphonic acid

4-[[3-[[(1,1-Dimethylethyl)amino]sulfonyl]-4-hydroxy-8-[(methylsulfonyl)amino]-1-naphthalenyl]azo]benzenesulfonic acid