(2S)-3-methyl-2-(1H-1,2,3,4-tetrazol-1-yl)butanoic acid

(2S)-3-methyl-2-(1H-pyrrol-1-yl)butanoic acid

(2S)-3-methyl-2-(2-phenoxyacetamido)butanoic acid

(2S)-3-methyl-2-(3-oxo-2,3-dihydro-1,2-benzothiazol-2-yl)butanoic acid

(2S)-3-methyl-2-(4-methylbenzenesulfonamido)butanoic acid

(2S)-3-methyl-2-(methylamino)butan-1-ol hydrochloride

(2S)-3-methyl-2-(N-{[2'-(1H-1,2,3,4-tetrazol-5-yl)-[1,1'-biphenyl]-4-yl]methyl}pentanamido)butanoic acid

(2S)-3-methyl-2-(phenylamino)butanoic acid

(2S)-3-methyl-2-(phenylformamido)butanoic acid

(2S)-3-methyl-2-(pyrrolidin-1-yl)butan-1-ol

(2S)-3-methyl-2-(trifluoroacetamido)butanoic acid

(2S)-3-methyl-2-[(2,2,2-trifluoroethyl)amino]butanoic acid hydrochloride

(2S)-3-methyl-2-[(2-methylphenyl)formamido]butanoic acid

(2S)-3-methyl-2-[(3-methyl-1,2-oxazol-5-yl)formamido]butanoic acid

(2S)-3-methyl-2-[(4-methylphenyl)formamido]butanoic acid

(2S)-3-methyl-2-[(pyrrolidine-1-carbonyl)amino]pentanoic acid

(2S)-3-methyl-2-[4-(methylsulfanyl)butanamido]butanoic acid

(2S)-3-methyl-2-[5-(methylsulfanyl)pentanamido]butanoic acid

(2S)-3-methyl-2-[methyl(nitroso)amino]butan-1-ol

(2S)-3-methyl-2-{[(2S)-5-oxopyrrolidin-2-yl]formamido}butanoic acid

(2S)-3-methyl-2-{[(propan-2-yloxy)carbonyl]amino}butanoic acid

(2S)-3-methylbutan-2-amine hydrochloride

(2S)-3-methylbutan-2-ol

(2S)-3-phenoxypropane-1,2-diol

(2S)-3-phenyl-2-(1H-pyrrol-1-yl)propanoic acid

(2S)-3-phenylpropane-1,2-diamine

(2S)-3-sulfanylpropane-1,2-diol

(2S)-3-[(3,3,3-trifluoropropyl)amino]propane-1,2-diol

(2S)-3-[(5R)-3-bromo-4,5-dihydro-1,2-oxazol-5-yl]-2-{[(tert-butoxy)carbonyl]amino}propanoic acid

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

(2S)-3-[(tert-butyldimethylsilyl)oxy]-2-methylpropan-1-ol

(2S)-3-[3-(chlorosulfonyl)-4-methoxyphenyl]-2-acetamidopropanoic acid

(2S)-3-[4-(benzyloxy)phenyl]-2-{[(tert-butoxy)carbonyl]amino}propanoic acid

(2S)-3-[4-(benzylsulfanyl)phenyl]-2-{[(tert-butoxy)carbonyl]amino}propanoic acid

(2S)-3-[4-(dimethylamino)phenyl]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

(2S)-3-[4-(tert-butoxy)phenyl]-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

(2S)-3-{1-[(benzyloxy)methyl]-1H-imidazol-5-yl}-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

(2S)-3-{1-[(tert-butoxy)carbonyl]-1H-indol-3-yl}-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

(2S)-3-{1-[(tert-butoxy)carbonyl]piperidin-4-yl}-2-methylpropanoic acid

(2S)-3-{4-[2-(tert-butoxy)-2-oxoethyl]phenyl}-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

(2S)-3-{bicyclo[1.1.1]pentan-1-yl}-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoic acid

(2S)-3-{bicyclo[1.1.1]pentan-1-yl}-2-{[(tert-butoxy)carbonyl]amino}propanoic acid

(2S)-3-{[(benzyloxy)carbonyl]amino}-2-hydroxypropanoic acid

(2S)-3-{[(benzyloxy)carbonyl]amino}-2-{[(tert-butoxy)carbonyl]amino}propanoic acid

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