(S)-N-(2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)ethyl)isobutyramide; N-(2-(2,6,7,8-tetrahydro-1H-indeno[5,4-b]furan-8-yl)ethyl)isobutyramide; (S)-N-(2-(2,6,7,8-tetrahydro-1H-indeno[5,4-b]furan-8-yl)ethyl)isobutyramide