CAS 1289646-76-9 appears in our catalog under these names: (S)-2-((tert-Butoxycarbonyl)amino)-3-(3-(methylsulfonyl)phenyl)propanoic acid, 98%, (S)–2–((tert–Butoxycarbonyl)amino)–3–(3–(methylsulfonyl)phenyl)propanoic acid, N-Boc-3-(methylsulfonyl)-L-phenylalanine, 95%, 95%, (S)-2-((tert-Butoxycarbonyl)amino)-3-(3-(methylsulfonyl)phenyl)propanoic acid, 97%. Offered by: AmBeed, GLPBio, Chemat, Fluorochem. Available pack sizes: 1g, 100mg, 250mg.