CAS 19448-61-4 appears in our catalog under these names: Propionic acid D6, Propionic Acid-d6, 98 atom % D, min 98% Chemical Purity, PROPIONIC ACID-D6, 98 ATOM % D. Offered by: Dr. Ehrenstorfer, CDN, Sigma-Aldrich. Available pack sizes: 100mg, 5g, 1g.