CAS 261380-19-2 appears in our catalog under these names: (R)-2-((tert-Butoxycarbonyl)amino)-5-phenylpent-4-enoic acid, 95%, Boc–3–styryl–D–alanine dicyclohexylamine salt, Dicyclohexylamine (R,E)-2-((tert-butoxycarbonyl)amino)-5-phenylpent-4-enoate, ≥98%, ≥98%, (R,E)-2-((tert-Butoxycarbonyl)amino)-5-phenylpent-4-enoic acid, ≥98%. Offered by: AmBeed, GLPBio, Chemat, Fluorochem. Available pack sizes: 1g, 250mg, 5g.