CAS 25638-17-9 appears in our catalog under these names: Sodium Butylnaphthalenesulfonate, Sodium butylnaphthalenesulfonate (ca. 40% in water), Sodium 4-butylnaphthalene-1-sulfonate, AR,≥60%, Butylnaphthalenesulfonic acid sodium salt, AR. Offered by: GLPBio, Fluorochem, Ambeed, Chemat. Available pack sizes: 100g, 500g, 1g, 25g, 5g.