CAS 109579-10-4 appears in our catalog under these names: tert-Butyl (2s,3s)-2-benzyl-3-hydroxy-5-oxopyrrolidine-1-carboxylate, 95%, (2S,3S)-tert-Butyl 2-benzyl-3-hydroxy-5-oxopyrrolidine-1-carboxylate, 95+%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 250mg, 1g, 100mg.