CAS 73-31-4 appears in our catalog under these names: Melatonin, Melatonin, >95% (HPLC), Melatonin 1.0 mg/ml in Methanol, Melatonin/ 99.79% (existing batch purity), Melatonin, 99+% . Offered by: Chemat Brand, TRC, Mikromol, LoGiCal, Dr. Ehrenstorfer. Available pack sizes: on request, 1g, 250mg, 50mg, 10mg, 1ml, 5g, 10mM (in 1ml dmso).