5-(acetylamino)-4-hydroxy-3-(phenylazo)naphthalene-2,7-disulphonic acid

ChEBI: A naphthalenesulfonic acid that is 3-(phenyldiazenyl)naphthalene-2,7-disulfonic acid carrying additional phenyldiazenyl, hydroxy and acetamido substituents at position 3, 4, and 5 respectively. The disodium salt is the biological stain 'azophloxine'.