CAS 120465-50-1 appears in our catalog under these names: Boc–4–aminobenzoic acid N–hydroxysuccinimide ester, Boc-4-Abz-OSu, 2,5-Dioxopyrrolidin-1-yl 4-((tert-butoxycarbonyl)amino)benzoate, 97%, 97%. Offered by: GLPBio, Biosynth, Chemat. Available pack sizes: 1g, 5g, 250mg, 500mg.