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

(2S)-2-{[(1S)-1-carboxy-2-{1-[(3,5-dichlorophenyl)methyl]-1H-imidazol-5-yl}ethyl]amino}-4-methylpentanoic acid

(2S)-2-{[(1S)-1-carboxyethyl]amino}-3-methylbutanoic acid hydrochloride

(2S)-2-{[(2S)-1-ethoxy-1-oxo-4-phenylbutan-2-yl]amino}propanoic acid

(2S)-2-{[(2S)-1-ethoxy-1-oxopentan-2-yl]amino}propanoic acid

(2S)-2-{[(2S)-1-ethoxy-1-oxopropan-2-yl]amino}-3-methylbutanoic acid

(2S)-2-{[(2S)-4-cyclohexyl-1-ethoxy-1-oxobutan-2-yl]amino}propanoic acid

(2S)-2-{[(2S)-4-cyclohexyl-1-ethoxy-1-oxobutan-2-yl]amino}propanoic acid hydrochloride

(2S)-2-{[(2S)-5-oxopyrrolidin-2-yl]formamido}pentanedioic acid

(2S)-2-{[(2S)-pyrrolidin-2-yl]formamido}pentanedioic acid; trifluoroacetic acid

(2S)-2-{[(2S,4R)-4-hydroxypyrrolidin-2-yl]formamido}propanoic acid; trifluoroacetic acid

(2S)-2-{[(4-chlorophenyl)methyl]amino}propanoic acid

(2S)-2-{[(4-methoxyphenyl)methyl]amino}-3-methylbutan-1-ol hydrochloride

(2S)-2-{[(9H-fluoren-9-ylmethoxy)carbonyl]amino}-3-(3-methyl-3H-diazirin-3-yl)propanoic acid

(2S)-2-{[(benzyloxy)carbonyl]amino}-2-(4-bromophenyl)acetic acid

(2S)-2-{[(benzyloxy)carbonyl]amino}-2-(4-hydroxyphenyl)acetic acid

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

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

(2S)-2-{[(benzyloxy)carbonyl]amino}-3-(1H-imidazol-4-yl)propanoic acid

(2S)-2-{[(benzyloxy)carbonyl]amino}-3-(3,4-dihydroxyphenyl)propanoic acid

(2S)-2-{[(benzyloxy)carbonyl]amino}-3-(naphthalen-2-yl)propanoic acid

(2S)-2-{[(benzyloxy)carbonyl]amino}-3-(pyridin-4-yl)propanoic acid

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

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

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

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

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

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

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

(2S)-2-{[(benzyloxy)carbonyl]amino}-4-methoxy-4-oxobutanoic acid

(2S)-2-{[(benzyloxy)carbonyl]amino}-5-carbamimidamidopentanoic acid

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

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

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

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

(2S)-2-{[(pyridin-2-yl)methyl]amino}propanoic acid hydrochloride

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

(2S)-2-{[(tert-butoxy)carbonyl](methyl)amino}-4-methylpentanoic acid

(2S)-2-{[(tert-butoxy)carbonyl](methyl)amino}butanoic acid

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

(2S)-2-{[(tert-butoxy)carbonyl]amino}-2-(2-fluorophenyl)acetic acid

(2S)-2-{[(tert-butoxy)carbonyl]amino}-2-(3-fluorophenyl)acetic acid

(2S)-2-{[(tert-butoxy)carbonyl]amino}-2-(4-chloro-3-fluorophenyl)acetic acid

(2S)-2-{[(tert-butoxy)carbonyl]amino}-2-(4-chlorophenyl)acetic acid

(2S)-2-{[(tert-butoxy)carbonyl]amino}-2-(4-fluorophenyl)acetic acid