CAS 19460-97-0 appears in our catalog under these names: Z-Ser(tbu)-osu, 95%, (S)-2,5-Dioxopyrrolidin-1-yl 2-(((benzyloxy)carbonyl)amino)-3-(tert-butoxy)propanoate, 97%, Z–Ser(tBu)–OSu, Z-L-Ser(tBu)-OSu. Offered by: Combi-blocks, AmBeed, GLPBio, Iris Biotech. Available pack sizes: 1g, 25g, 5g.