CAS 66521-38-8 appears in our catalog under these names: Melatonin-d4, >95% (HPLC), N-Acetyl-5-methoxytryptamine-alpha,alpha,beta,beta-d4, 98 atom % D, min 98% Chemical Purity, Melatonin-d4, Melatonin D5, Melatonin-d4, 99.70%. Offered by: TRC, CDN, TargetMol, GLPBio, MedChemExpress. Available pack sizes: 10mg, 2,5mg, 50mg, 0,01g, 0,005g, 1mg, 5mg, 25mg.