CAS 42417-70-9 appears in our catalog under these names: Z-N-Me-asp(otbu)-oh dcha, 98%, Cbz-N-Me-Asp(OtBu)-OH 98%, (S)-2-(((Benzyloxy)carbonyl)(methyl)amino)-4-(tert-butoxy)-4-oxobutanoic acid, 98%, 98%, Z-L-MeAsp(OtBu)-OH*DCHA. Offered by: Combi-blocks, Ambeed, Chemat, Iris Biotech. Available pack sizes: 250mg, 5g, 1g, 100mg, 10g, 25g.