CAS 50305-28-7 appears in our catalog under these names: Z-Trp-osu, 98%, Z-Trp-OSu, 98+%, Z–Trp–OSu, Z-L-Trp-OSu, N-alpha-Z-L-tryptophan N-hydroxysuccinimide ester. Offered by: Combi-blocks, AmBeed, GLPBio, Iris Biotech, Biosynth. Available pack sizes: 1g, 25g, 5g, 10g.