(2R)-4-[(piperidin-4-yl)amino]butan-2-ol dihydrochloride

(2R)-4-[(tert-butoxy)carbonyl]-1,4-oxazepane-2-carboxylic acid

(2R)-4-[(tert-butoxy)carbonyl]-5,5-dimethylmorpholine-2-carboxylic acid

(2R)-4-[(tert-butoxy)carbonyl]-6,6-dimethylmorpholine-2-carboxylic acid

(2R)-4-[(tert-butoxy)carbonyl]-6-oxopiperazine-2-carboxylic acid

(2R)-4-[(tert-butoxy)carbonyl]morpholine-2-carboxylic acid

(2R)-4-[(tert-butoxy)carbonyl]piperazine-2-carboxylic acid hydrochloride

(2R)-4-{[(tert-butoxy)carbonyl]amino}-2-hydroxybutanoic acid

(2R)-4-{[(tert-butoxy)carbonyl]amino}-2-methoxybutanoic acid

(2R)-5,5-difluorohexan-2-amine hydrochloride

(2R)-5,5-dimethylmorpholine-2-carboxylic acid hydrochloride

(2R)-5-(carbamoylamino)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanoic acid

(2R)-5-(tert-butoxy)-2-(dimethylamino)-5-oxopentanoic acid

(2R)-5-(tert-butoxy)-2-(methylamino)-5-oxopentanoic acid

(2R)-5-(tert-butoxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methyl-5-oxopentanoic acid

(2R)-5-(tert-butoxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-5-oxopentanoic acid

(2R)-5-amino-2-(methylamino)pentanoic acid dihydrochloride

(2R)-5-bromo-2-methyl-2,3-dihydro-1H-indole

(2R)-5-methanesulfonylpentan-2-amine hydrochloride

(2R)-5-nitropentan-2-ol

(2R)-5-oxooxolane-2-carboxylic acid

(2R)-5-oxopyrrolidine-2-carboxylic acid

(2R)-5-{[(benzyloxy)carbonyl]amino}-2-{[(tert-butoxy)carbonyl]amino}pentanoic acid

(2R)-5-{[(tert-butoxy)carbonyl]amino}-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanoic acid

(2R)-6,6-dimethylmorpholine-2-carboxylic acid hydrochloride

(2R)-6-amino-2-(dimethylamino)hexanoic acid dihydrochloride

(2R)-6-amino-2-{[(tert-butoxy)carbonyl]amino}hexanoic acid

(2R)-6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid

(2R)-6-methoxy-2,5,7,8-tetramethyl-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid

(2R)-6-nitro-2,3-dihydro-1H-indole-2-carboxylic acid

(2R)-6-oxopiperidine-2-carboxylic acid

(2R)-6-{[(benzyloxy)carbonyl]amino}-2-{[(tert-butoxy)carbonyl]amino}hexanoic acid

(2R)-6-{[(tert-butoxy)carbonyl]amino}-2-(dimethylamino)hexanoic acid

(2R)-6-{[(tert-butoxy)carbonyl]amino}-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanoic acid

(2R)-azetidine-2-carboxamide; trifluoroacetic acid

(2R)-azetidine-2-carboxylic acid

(2R)-bicyclo[2.2.2]octan-2-amine hydrochloride

(2R)-bicyclo[2.2.2]octane-2-carboxylic acid

(2R)-but-3-yn-2-amine hydrochloride

(2R)-butan-2-amine

(2R)-butan-2-amine hydrochloride

(2R)-butan-2-ol

(2R)-butane-1,2-diol

(2R)-hept-6-yn-2-ol

(2R)-hex-5-en-2-ol