CAS 51621-57-9 appears in our catalog under these names: H-D-Lys(ac)-oh, 95%, H–D–Lys(Ac)–OH, (R)-6-Acetamido-2-aminohexanoic acid, 95%, (R)-6-Acetamido-2-aminohexanoic acid, 98%, Ne-Acetyl-D-lysine, 98%. Offered by: Combi-blocks, GLPBio, Ambeed, BLDpharm, Chemat. Available pack sizes: 250mg, 5g, 1g, 100mg.