The molecule is an organic sodium salt that is the disodium salt of 7-hydroxy-8-[(E)-phenyldiazenyl]naphthalene-1,3-disulfonic acid. It is often combined with other yellow dyes in alcoholic solution to stain erythrocytes in trichrome methods, and is used for demonstrating cells in the pancreas and pituitary. It has a role as a histological dye. It contains a 7-hydroxy-8-[(E)-phenyldiazenyl]naphthalene-1,3-disulfonate.
disodium;7-hydroxy-8-phenyldiazenylnaphthalene-1,3-disulfonate