CAS 34582-31-5 appears in our catalog under these names: 1-tert-butyl 4-methyl (2S)-2-{[(tert-butoxy)carbonyl]amino}butanedioate, 98%, 1-tert-Butyl 4-methyl (2S)-2-{((tert-butoxy)carbonyl)amino}butanedioate, 95%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 5g, 1g.