CAS 289889-03-8 appears in our catalog under these names: 3-[Benzyl(tert-butoxycarbonyl)amino]propanoic acid, 95%, 3-(Benzyl(tert-butoxycarbonyl)amino)propanoic acid, 98%. Offered by: Combi-blocks, AmBeed, Fluorochem. Available pack sizes: 1g, 10g, 5g, 25g.