(2S,3S,6R)-4-methoxy-16,18-dioxa-10-azapentacyclo[11.7.0.0^{2,6}.0^{6,10}.0^{15,19}]icosa-1(13),4,14,19-tetraen-3-yl 1-methyl (3R)-3-hydroxy-3-(4-hydroxy-4-methylpentyl)butanedioate

(2S,4aS,6aS,6bR,8aR,10S,12aS,12bR,14bS)-10-hydroxy-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-icosahydropicene-2-carboxylic acid

(2S,4E)-2-{[(tert-butoxy)carbonyl]amino}-6-methoxy-6-oxohex-4-enoic acid

(2S,4R)-1-(2-{[(tert-butoxy)carbonyl]amino}acetyl)-4-hydroxypyrrolidine-2-carboxylic acid

(2S,4R)-1-(4-fluorobenzenesulfonyl)-4-hydroxypyrrolidine-2-carboxylic acid

(2S,4R)-1-(4-tert-butylbenzenesulfonyl)-4-hydroxypyrrolidine-2-carboxylic acid

(2S,4R)-1-(adamantane-1-carbonyl)-4-hydroxypyrrolidine-2-carboxylic acid

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

(2S,4R)-1-benzoyl-4-hydroxypyrrolidine-2-carboxamide

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

(2S,4R)-1-[(2R)-3,3-dimethyl-2-(2-{2-[4-(6-{[4-(trifluoromethoxy)phenyl]amino}pyrimidin-4-yl)phenoxy]ethoxy}acetamido)butanoyl]-4-hydroxy-N-{[4-(4-methyl-1,3-thiazol-5-yl)phenyl]methyl}pyrrolidine-2-carboxamide

(2S,4R)-1-[(2S)-2-(14-amino-3,6,9,12-tetraoxatetradecanamido)-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(4-methyl-1,3-thiazol-5-yl)phenyl]methyl}pyrrolidine-2-carboxamide dihydrochloride

(2S,4R)-1-[(2S)-2-(2-{4-[(4'-{3-[4-cyano-3-(trifluoromethyl)phenyl]-5,5-dimethyl-4-oxo-2-sulfanylideneimidazolidin-1-yl}-[1,1'-biphenyl]-4-yl)oxy]butoxy}acetamido)-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(4-methyl-1,3-thiazol-5-yl)phenyl]methyl}pyrrolidine-2-carboxamide

(2S,4R)-1-[(2S)-2-(8-aminooctanamido)-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(4-methyl-1,3-thiazol-5-yl)phenyl]methyl}pyrrolidine-2-carboxamide

(2S,4R)-1-[(2S)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-3,3-dimethylbutanoyl]-4-hydroxypyrrolidine-2-carboxylic acid

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

(2S,4R)-1-[(2S)-2-acetamido-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(4-methyl-1,3-thiazol-5-yl)phenyl]methyl}pyrrolidine-2-carboxamide

(2S,4R)-1-[(2S)-2-acetamido-3,3-dimethylbutanoyl]-4-hydroxypyrrolidine-2-carboxylic acid

(2S,4R)-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,4R)-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 dihydrochloride

(2S,4R)-1-[(2S)-2-amino-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(1,3-thiazol-2-yl)phenyl]methyl}pyrrolidine-2-carboxamide hydrochloride

(2S,4R)-1-[(2S)-2-amino-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(1H-1,2,3-triazol-1-yl)phenyl]methyl}pyrrolidine-2-carboxamide hydrochloride

(2S,4R)-1-[(2S)-2-amino-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(2-methyl-1H-imidazol-1-yl)phenyl]methyl}pyrrolidine-2-carboxamide dihydrochloride

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

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

(2S,4R)-1-[(2S)-2-amino-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(5-methyl-1,2,4-oxadiazol-3-yl)phenyl]methyl}pyrrolidine-2-carboxamide hydrochloride

(2S,4R)-1-[(2S)-2-amino-3,3-dimethylbutanoyl]-4-hydroxypyrrolidine-2-carboxylic acid hydrochloride

(2S,4R)-1-[(2S)-2-amino-3,3-dimethylbutanoyl]-N-{[4-(3,5-dimethyl-1H-pyrazol-1-yl)phenyl]methyl}-4-hydroxypyrrolidine-2-carboxamide dihydrochloride

(2S,4R)-1-[(2S)-2-[(1-fluorocyclopropyl)formamido]-3,3-dimethylbutanoyl]-4-hydroxy-N-{[2-hydroxy-4-(4-methyl-1,3-thiazol-5-yl)phenyl]methyl}pyrrolidine-2-carboxamide

(2S,4R)-1-[(2S)-2-[(1-fluorocyclopropyl)formamido]-3,3-dimethylbutanoyl]-4-hydroxypyrrolidine-2-carboxylic acid

(2S,4R)-1-[(2S)-2-[(2R)-2-aminopropanamido]-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(4-methyl-1,3-thiazol-5-yl)phenyl]methyl}pyrrolidine-2-carboxamide dihydrochloride

(2S,4R)-1-[(2S)-2-[5-(2-{2,3-difluoro-6-[2-(morpholin-4-yl)-1,3-thiazol-4-yl]phenoxy}acetamido)pentanamido]-3,3-dimethylbutanoyl]-4-hydroxy-N-[(1S)-1-[4-(4-methyl-1,3-thiazol-5-yl)phenyl]ethyl]pyrrolidine-2-carboxamide

(2S,4R)-1-[(2S)-2-{2-[2-(2-aminoethoxy)ethoxy]acetamido}-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(4-methyl-1,3-thiazol-5-yl)phenyl]methyl}pyrrolidine-2-carboxamide dihydrochloride

(2S,4R)-1-[(2S)-2-{2-[4-(4-{3-[2,6-difluoro-3-(propane-1-sulfonamido)benzoyl]-1H-pyrrolo[2,3-b]pyridin-5-yl}phenyl)piperazin-1-yl]acetamido}-3,3-dimethylbutanoyl]-4-hydroxy-N-{[4-(4-methyl-1,3-thiazol-5-yl)phenyl]methyl}pyrrolidine-2-carboxamide

(2S,4R)-1-[(2S)-2-{[(tert-butoxy)carbonyl]amino}-3,3-dimethylbutanoyl]-4-hydroxypyrrolidine-2-carboxylic acid

(2S,4R)-1-[(2S)-3,3-dimethyl-2-{3-[2-(4-{[4-({[3-(N-methylmethanesulfonamido)phenyl]methyl}amino)-5-(trifluoromethyl)pyrimidin-2-yl]amino}phenoxy)ethoxy]propanamido}butanoyl]-4-hydroxy-N-{[4-(4-methyl-1,3-thiazol-5-yl)phenyl]methyl}pyrrolidine-2-carboxamide

(2S,4R)-1-[(benzyloxy)carbonyl]-4-hydroxypyrrolidine-2-carboxylic acid

(2S,4R)-1-[(benzyloxy)carbonyl]-4-methoxypyrrolidine-2-carboxylic acid

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

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

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

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

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

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

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