CAS 40856-59-5 appears in our catalog under these names: (S)–(–)–Alpha–(Boc–amino)–gamma–butyrolactone, Boc-Hse-Lactone 98%, Boc-L-Homoserine lactone, 98%, 98%, Boc-L-Homoserine lactone, 95%. Offered by: GLPBio, Ambeed, Chemat, Fluorochem. Available pack sizes: 100g, 10g, 25g, 1g, 5g, 50g.