7-Amino-1,3-naphthalenedisulfonic acid (monopotassium) (monohydrate)

7-Amino-1,3-naphthalenedisulfonic acid monopotassium (mono-Potassium 7-amino-1,3-naphthalenedisulfonate) monohydrate is a fluorescent dye that can be used to label carbohydrates (λex/λem = 310/450 nm).