(2S,3R)-2-amino-3-(1H-indol-3-yl)butanoic acid hydrochloride

(2S,3R)-2-amino-3-(benzyloxy)butanoic acid

(2S,3R)-2-amino-3-(prop-2-yn-1-yloxy)butanoic acid; trifluoroacetic acid

(2S,3R)-2-amino-3-(tert-butoxy)-N-methylbutanamide

(2S,3R)-2-amino-3-(tert-butoxy)butanoic acid

(2S,3R)-2-amino-3-fluorobutanoic acid hydrochloride

(2S,3R)-2-amino-3-hydroxy-N-methylbutanamide hydrochloride

(2S,3R)-2-amino-3-hydroxybutanamide hydrochloride

(2S,3R)-2-amino-3-hydroxybutanedioic acid hydrochloride

(2S,3R)-2-amino-3-hydroxybutanoic acid

(2S,3R)-2-amino-3-methoxybutanoic acid

(2S,3R)-2-amino-3-methylpentanoic acid

(2S,3R)-2-aminobutane-1,3-diol

(2S,3R)-2-azido-3-methoxybutane

(2S,3R)-2-hydroxy-3-methoxybutanoic acid

(2S,3R)-2-hydroxy-3-methylbutanedioic acid

(2S,3R)-2-methylmorpholine-3-carboxylic acid hydrochloride

(2S,3R)-2-methylpyrrolidin-3-ol hydrochloride

(2S,3R)-2-{[(tert-butoxy)carbonyl]amino}-3-(prop-2-yn-1-yloxy)butanoic acid

(2S,3R)-2-{[(tert-butoxy)carbonyl]amino}-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

(2S,3R)-2-{[(tert-butoxy)carbonyl]amino}-3-hydroxybutanoic acid

(2S,3R)-2-{[(tert-butoxy)carbonyl]amino}-3-methoxybutanoic acid

(2S,3R)-2-{[(tert-butoxy)carbonyl]amino}-3-[(tert-butyldimethylsilyl)oxy]butanoic acid

(2S,3R)-3-(benzyloxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

(2S,3R)-3-(dimethylamino)butan-2-ol hydrochloride

(2S,3R)-3-(tert-butoxy)-1-[(tert-butoxy)carbonyl]azetidine-2-carboxylic acid

(2S,3R)-3-(tert-butoxy)-2-(2-{[(tert-butoxy)carbonyl]amino}acetamido)butanoic acid

(2S,3R)-3-(tert-butoxy)-2-(dimethylamino)butanoic acid

(2S,3R)-3-(tert-butoxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

(2S,3R)-3-(tert-butoxy)-2-{[(tert-butoxy)carbonyl]amino}butanoic acid

(2S,3R)-3-amino-2-hydroxy-4-phenylbutanamide hydrochloride

(2S,3R)-3-amino-2-hydroxy-4-phenylbutanoic acid

(2S,3R)-3-amino-2-{[(tert-butoxy)carbonyl]amino}butanoic acid

(2S,3R)-3-aminobutan-2-ol

(2S,3R)-3-aminobutan-2-ol hydrochloride

(2S,3R)-3-azidobutan-2-ol

(2S,3R)-3-hydroxy-2-methyl-3-phenylpropanoic acid

(2S,3R)-3-hydroxy-2-methylbutanoic acid

(2S,3R)-3-hydroxy-2-methylpentanoic acid

(2S,3R)-3-hydroxy-2-{[(2S)-pyrrolidin-2-yl]formamido}butanoic acid hydrochloride

(2S,3R)-3-methoxybutan-2-amine

(2S,3R)-3-methoxybutan-2-amine hydrochloride

(2S,3R)-3-[(tert-butyldimethylsilyl)oxy]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

(2S,3R)-4-(tert-butoxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3-methyl-4-oxobutanoic acid

(2S,3R)-4-[(tert-butoxy)carbonyl]-2-methylmorpholine-3-carboxylic acid