CAS 39571-37-4 appears in our catalog under these names: tert-Butyl [(1s)-1-(hydrazinocarbonyl)-2-methylbutyl]carbamate, 95%, tert-Butyl ((2S)-1-hydrazinyl-3-methyl-1-oxopentan-2-yl)carbamate, 97%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 250mg, 5g, 1g.