The molecule is a naphthalenesulfonic acid that is naphthalene-1,3-disulfonic acid carrying additional hydroxy and phenyldiazenyl substituents at positions 7 and 8 respectively. The disodium salt is the biological stain 'orange G'. It is a member of azobenzenes, a naphthalenesulfonic acid and a member of naphthols. It is a conjugate acid of a 7-hydroxy-8-[(E)-phenyldiazenyl]naphthalene-1,3-disulfonate.
7-hydroxy-8-phenyldiazenylnaphthalene-1,3-disulfonic acid