CAS 77568-65-1 appears in our catalog under these names: γ–Butyrolactone–d6, Butyrolactone-d6, 99 atom % D, min 98% Chemical Purity, Butyrolactone-d6, GAMMA-BUTYROLACTONE-D6, 98 ATOM % D. Offered by: GLPBio, CDN, Biosynth, Sigma-Aldrich. Available pack sizes: 1mg, 1g, 5mg, 25mg, 50mg, 100mg, 5G.