4-Aminobenzenesulfonic acid

4-Aminobenzenesulfonic acid (sulfanilic acid, CAS 121-57-3) is used as an intermediate in dyes, perfumes, food pigments, medicines, pesticides and building materials, and is offered at pharmaceutical grade by Inner Mongolia Bolin Pharmaceutical Co., Ltd., which distributes rather than manufactures the product. It is sold across North America, Central/South America, Europe, Australasia, Asia, the Middle East and Africa.