CAS 155892-27-6 appears in our catalog under these names: Fmoc-L-Tyr(tBu)-OSu, 97%, Fmoc–l–tyr(tbu)–osu, Fmoc-Tyr(tBu)-Osu, 95%, Fmoc-l-tyr(tbu)-osu, 95%, 2,5-Dioxopyrrolidin-1-yl (S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(4-(tert-butoxy)phenyl)propanoate, 95%. Offered by: Combi-blocks, GLPBio, Ambeed, Chemat, BLDpharm. Available pack sizes: 1g, 25g, 5g, 250mg, 10g.