ROZEREM (ramelteon) is an orally active hypnotic chemically designated as (S)-N-[2-(1, 6, 7, 8tetrahydro-2H-indeno-[5, 4-b]furan-8-yl)ethyl]propionamide and containing one chiral center. The compound is produced as the (S)-enantiomer, with an empirical formula of C16H21NO2, molecular weight of 259.34, and the following chemical structure: