(2S,4R)-N-[(1R,2R)-2-hydroxy-1-[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(methylsulfanyl)oxan-2-yl]propyl]-1-methyl-4-propylpyrrolidine-2-carboxamide hydrochloride

(2S,4R)-N-[(1R,2R)-2-hydroxy-1-[(2R,3R,5R,6R)-3,4,5-trihydroxy-6-(methylsulfanyl)oxan-2-yl]propyl]-1-methyl-4-propylpyrrolidine-2-carboxamide hydrochloride

(2S,4S)-1-acetyl-4-hydroxypyrrolidine-2-carboxylic acid

(2S,4S)-1-[(2E)-4,4-difluorobut-2-enoyl]-4-methoxypyrrolidine-2-carboxylic acid

(2S,4S)-1-[(2S)-2-amino-3,3-dimethylbutanoyl]-4-hydroxy-N-[(1S)-1-[4-(4-methyl-1,3-thiazol-5-yl)phenyl]ethyl]pyrrolidine-2-carboxamide

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-(1H-1,2,3-triazol-1-yl)pyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-(difluoromethoxy)pyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-(methoxymethyl)pyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-(pyridin-4-yloxy)pyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-(trifluoromethoxy)pyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-(trifluoromethyl)pyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-({[(tert-butoxy)carbonyl]amino}methyl)pyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-chloropyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-cyclohexylpyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-fluoro-2-methylpyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-fluoropyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-hydroxy-4-(trifluoromethyl)pyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-hydroxypyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-isocyano-2-(methoxycarbonyl)pyrrolidine

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-methoxy-4-(trifluoromethyl)pyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-methoxypyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-methylpyrrolidine-2-carboxylic acid

(2S,4S)-1-[(tert-butoxy)carbonyl]-4-phenoxypyrrolidine-2-carboxylic acid

(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-(methoxymethyl)pyrrolidine-2-carboxylic acid

(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-(pyridin-4-yloxy)pyrrolidine-2-carboxylic acid

(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-(trifluoromethyl)pyrrolidine-2-carboxylic acid

(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-fluoro-2-methylpyrrolidine-2-carboxylic acid

(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-fluoropyrrolidine-2-carboxylic acid

(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-hydroxy-4-(trifluoromethyl)pyrrolidine-2-carboxylic acid

(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-methoxypyrrolidine-2-carboxylic acid

(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-phenoxypyrrolidine-2-carboxylic acid

(2S,4S)-1-{[(9H-fluoren-9-yl)methoxy]carbonyl}-4-phenylpyrrolidine-2-carboxylic acid

(2S,4S)-2,4-dimethylazetidine hydrochloride

(2S,4S)-2,4-dimethylpiperidine hydrochloride

(2S,4S)-2,5-bis({[(tert-butoxy)carbonyl]amino})-4-fluoropentanoic acid

(2S,4S)-2,5-diamino-4-fluoropentanoic acid dihydrochloride

(2S,4S)-2-(azidomethyl)-4-(methoxymethyl)pyrrolidine

(2S,4S)-2-(fluoromethyl)-4-methoxypyrrolidine hydrochloride

(2S,4S)-2-(oxan-4-yl)-3,4-dihydro-2H-1-benzopyran-4-ol

(2S,4S)-2-(propan-2-yl)-3,4-dihydro-2H-1-benzopyran-4-ol

(2s,4s)-2-(trifluoromethyl)-8-oxa-5-azaspiro[3.5]nonan-2-ol hydrochloride

(2S,4S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-fluoropentanedioic acid

(2S,4S)-2-amino-4-carbamoyl-4-fluorobutanoic acid hydrochloride

(2S,4S)-2-amino-4-fluoro-5-methoxy-5-oxopentanoic acid hydrochloride

(2S,4S)-2-amino-4-fluoropentanedioic acid hydrochloride