CAS 218916-64-4 appears in our catalog under these names: 3-Amino-N-Boc-2-hydroxy-propionic acid, 97%, 3–((tert–Butoxycarbonyl)amino)–2–hydroxypropanoic acid, Boc-DL-IsoSer-OH 97%, 3-((tert-Butoxycarbonyl)amino)-2-hydroxypropanoic acid, 97%, 97%. Offered by: Combi-blocks, GLPBio, Ambeed, Chemat, Fluorochem. Available pack sizes: 250mg, 5g, 1g, 10g, 25g, 100g, 100mg.