(R)-N-(2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)ethyl)propionamide; Ramelteon R-Isomer; N-[2-[(8R)-1,6,7,8-Tetrahydro-2H-indeno[5,4-b]furan-8-yl]ethyl]propanamide; (R)-N-[2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)ethyl]propanamide;(R)-N-(2-(2,6,7,8-Tetrahydro-1H-indeno[5,4-b]furan-8-yl)ethyl)propionamide