CAS 160401-16-1 appears in our catalog under these names: 1–(tert–Butoxycarbonyl)–5–oxopyrrolidine–2–carboxylic acid, 1-(tert-Butoxycarbonyl)-5-oxopiperidine-2-carboxylic acid, 95%, 1-(tert-Butoxycarbonyl)-5-oxopyrrolidine-2-carboxylic acid, 97%, Boc-DL-5-Oxo-Pro-OH, 95%, N-Boc-5-oxo-DL-proline, 97%. Offered by: GLPBio, Fluorochem, Ambeed, Chemat, BLDpharm. Available pack sizes: 100mg, 1g, 250mg, 5g, 10g.