(4R)-4-(hydroxymethyl)pyrrolidin-2-one

(4R)-4-(iodomethyl)-2,2-dimethyl-1,3-dioxolane

(4R)-4-(methoxymethyl)-1,3-dioxolan-2-one

(4R)-4-(propan-2-yl)-1,3-oxazolidin-2-one

(4R)-4-(propan-2-yl)-1lambda6,2,5-thiadiazolidine-1,1,3-trione

(4R)-4-(trifluoromethyl)imidazolidin-2-one

(4R)-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanoic acid

(4R)-4-amino-1,2-oxazolidin-3-one

(4R)-4-amino-1-methylpyrrolidin-2-one

(4R)-4-amino-2,2-dimethylpentan-1-ol

(4R)-4-amino-2-methyl-1,2-oxazolidin-3-one hydrochloride

(4R)-4-amino-3,4-dihydro-2H-1-benzopyran-6-carbonitrile hydrochloride

(4R)-4-amino-3,4-dihydro-2H-1-benzopyran-6-ol hydrochloride

(4R)-4-amino-4-(4-chloro-3-fluorophenyl)butan-1-ol hydrochloride

(4R)-4-amino-5,5-difluoropentanoic acid hydrochloride

(4R)-4-amino-5-(tert-butoxy)-5-oxopentanoic acid

(4R)-4-amino-5-methoxy-2,2-dimethylpentanoic acid hydrochloride

(4R)-4-aminooxolan-2-one hydrochloride

(4R)-4-aminopentan-1-ol hydrochloride

(4R)-4-aminopentanoic acid hydrochloride

(4R)-4-aminopyrrolidin-2-one hydrochloride

(4R)-4-aminopyrrolidin-2-one; trifluoroacetic acid

(4R)-4-azido-6,8-dimethyl-3,4-dihydro-2H-1-benzopyran

(4R)-4-azido-6-bromo-3,4-dihydro-2H-1-benzopyran

(4R)-4-azido-6-fluoro-2,2-dimethyl-3,4-dihydro-2H-1-benzopyran

(4R)-4-azido-6-fluoro-3,4-dihydrospiro[1-benzopyran-2,1'-cyclobutane]

(4R)-4-azido-6-fluoro-3,4-dihydrospiro[1-benzopyran-2,1'-cyclopentane]

(4R)-4-azido-6-methoxy-3,4-dihydro-2H-1-benzopyran

(4R)-4-azido-8-bromo-3,4-dihydro-2H-1-benzopyran

(4R)-4-benzyl-1,3,2lambda6-dioxathiolane-2,2-dione

(4R)-4-benzyl-1,3-oxazolidin-2-one

(4R)-4-ethyl-1,3,2lambda6-dioxathiolane-2,2-dione

(4R)-4-hydroxy-1-methylpyrrolidin-2-one

(4R)-4-hydroxy-3,4-dihydro-2H-1lambda6-benzothiopyran-1,1-dione

(4R)-4-hydroxypiperidin-2-one

(4R)-4-hydroxypyrrolidin-2-one

(4R)-4-methyl-1,2,3-oxathiazolidine-2,2-dione

(4R)-4-methyl-1,3,2lambda6-dioxathiane-2,2-dione

(4R)-4-methyl-1,3,2lambda6-dioxathiolane-2,2-dione

(4R)-4-methyl-1,3-oxazinan-2-one

(4R)-4-methyl-1,3-oxazolidin-2-one

(4R)-4-methyl-1H,2H,3H,4H-pyrrolo[1,2-a]pyrazine

(4R)-4-methyl-3,4-dihydro-2H-5,1lambda6,2-benzoxathiazepine-1,1-dione

(4R)-4-methylazetidin-2-one

(4R)-4-methylpyrrolidin-2-one