Alizarin Red S (also known as C.I. Mordant Red 3, Alizarin Carmine, and C.I 58005.It is a water-soluble sodium salt of Alizarin sulfonic acid with a chemical formula of C14H7NaO7S.
Alizarin red S is an organic sodium salt having 3,4-dihydroxy-9,10-dioxo-9,10-dihydroanthracene-2-sulfonate as the counterion.It has a role as a histological dye. It is an organic sodium salt and an organosulfonate salt. It contains a 3,4-dihydroxy-9,10-dioxo-9,10-dihydroanthracene-2-sulfonate.