6-Acetylamino-1-hydroxy-8'-(2-sulfooxyethylsulfonyl)[2,2'-azobisnaphthalene]-3,6'-disulfonic acid

7-acetamido-4-hydroxy-3-[[6-sulpho-8-[[2-(sulphooxy)ethyl]sulphonyl]-2-naphthyl]azo]naphthalene-2-sulphonic acid

7-(Acetylamino)-4-hydroxy-3-[[6-sulfo-8-[[2-(sulfooxy)ethyl]sulfonyl]2-naphthalenyl]azo]-2-naphthalenesulfonic acid