CAS 31432-48-1 appears in our catalog under these names: Ammonium–15N nitrate, AMMONIUM-15N NITRATE 60%, AMMONIUM-15N NITRATE, 5 ATOM % 15N, AMMONIUM-15N NITRATE, 10 ATOM % 15N, Nitric acid, ammonium-15N salt, ≥10 atom%,≥98.5%, ≥10 atom%,≥98.5%. Offered by: GLPBio, Sigma-Aldrich, Chemat. Available pack sizes: 1g, 25g, 5g, 100G, 50G.