(2S)-1-[(2S)-2-amino-4-{4-[bis(4-fluorophenyl)methyl]piperazin-1-yl}-4-oxobutanoyl]pyrrolidine-2-carbonitrile

(2S,3R)-2-amino-1-(isoindolin-2-yl)-3-methylpentan-1-one

(S)-1-((S)-2-amino-5-(1-oxoisoindolin-2-yl)pentanoyl)pyrrolidine-2-carbonitrile

(2R)-1-{(2S, 4S)-4-[2-(1,3-Dihydroisoindol-2-yl)-2-oxoethyl]-5-oxopyrrolidine-2-carbonyl}pyrrolidine-2-boronic Acid

(R)-1-(2-(1-naphthamido)acetyl)pyrrolidin-2-ylboronic acid

(R)-1-(2-(1-oxoisoindolin-2-yl)acetyl)pyrrolidin-2-ylboronic acid

(2S)-1-{2-[(3-hydroxyadamantan-1-yl)amino]acetyl}pyrrolidine-2-carbonitrile

(1R)-3-oxo-3-[3-(trifluoroethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-(2,4,5-trifluorobenzyl)propylamine

(2S)-1-({(2S,4S)-4-[2-(1,3-Dihydro-2H-isoindol-2-yl)-2-oxoethyl]-5-oxopyrrolidin-2-yl}carbonyl)-4,4-difluoropyrrolidine-2-carbonitrile

(S)-N-(2-(2-cyanopyrrolidin-1-yl)-2-oxoethyl)-1-naphthamide

2-(S)-Amino-4-(2-chloro-benzylamino)-1-piperidin-1-yl-butan-1-one

(2S,4S)-1-({(2S,4S)-4-[2-(1,3-Dihydro-2H-isoindol-2-yl)-2-oxoethyl]-5-oxopyrrolidin-2-yl}carbonyl)-4-fluoropyrrolidine-2-carbonitrile

(S)-1-((2S,4R)-4-(2-(isoindolin-2-yl)-2-oxoethyl)-5-oxopyrrolidine-2-carbonyl)pyrrolidine-2-carbonitrile

(2S)-1-[{(2S,4S)-5-Oxo-4-(2-oxo-2-(piperidin-1-yl)ethyl)pyrrolidine-2-yl}carbonyl]pyrrolidine-2-carbonitrile

(2S)-1-{(2S,4S)-4-[2-(1,3-Dihydroisoindol-2-yl)-2-oxoethyl]-5-oxopyrrolidine-2-carbonyl}pyrrolidine-2-carboxylic Acid tert-Butylamide

(2S)-1-({(2S,4S)-4-[2-[4-(Pyridine-4-yl)-piperazin-1-yl]-2-oxoethyl]-5-oxopyrrolidin-2-yl}carbonyl)pyrrolidine-2-carbonitrile

(2S)-1-{(2S,4S)-4-[2-(5-Fluoro-1,3-dihydroisoindol-2-yl)-2-oxoethyl]-5-oxopyrrolidine-2-carbonyl}pyrrolidine-2-carbonitrile

(2S)-1-({(2S,4S)-4-[2-[4-(4-Chlorophenyl)-3,6-dihydropyridin-1(2H)-yl]-2-oxoethyl]-5-oxopyrrolidin-2-yl}carbonyl)pyrrolidine-2-carbonitrile

(2S)-1-({(2S,4S)-4-[2-(5-Chloro-1,3-dihydro-2H-isoindol-2-yl)-2-oxoethyl]-5-oxopyrrolidin-2-yl}carbonyl)pyrrolidine-2-carbonitrile

(2S)-1-({(2S,4S)-4-[2-(1,3-Dihydro-2H-isoquinol-2-yl)-2-oxoethyl]-5-oxopyrrolidin-2-yl}carbonyl)pyrrolidine-2-carbonitrile

(3S,5S)-3-[2-(1,3-Dihydro-2H-isoindol-2-yl)-2-oxoethyl]-5-(1,3-thiazolidin-3-ylcarbonyl)pyrrolidin-2-one

(3S,5S)-3-[2-(1,3-Dihydroisoindol-2-yl)-2-oxoethyl]-5-(pyrrolidine-1-carbonyl)pyrrolidin-2-one

(2S)-1-({(2S,4S)-4-[2-(1,3-Dihydroisoindol-2-yl)-2-oxoethyl]-5-oxopyrrolidine-2-carbonyl}pyrrolidine-2-carboxylic Acid Amide

(2S)-1-{(2S, 4S)-4-[2-(1,3-Dihydroisoindol-2-yl)-2-oxoethyl]-5-oxopyrrolidine-2-carbonyl}pyrrolidine-2-carbonitrile

(2S)-1-({(2S,4S)-5-Oxo-4-[2-oxo-2-(pyrrolidin-1-yl)ethyl]pyrrolidin-2-yl}carbonyl)pyrrolidine-2-carbonitrile

2S)-1-({(2S,4S)-5-oxo-4-[2-Oxo-[2-(trifluoromethyl)-5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl]ethyl]pyrrolidin-2-yl}carbonyl)-pyrrolidine-2-carbonitrile

(2S)-1-({(2S,4S)-5-Oxo-4-[2-oxo-2-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]ethyl]pyrrolidin-2-yl}carbonyl)pyrrolidine-2-carbonitrile

(2S,4S)-1-{(2S,4S)-4-[2-(5-Chloro-1,3-dihydroisoindol-2-yl)-2-oxoethyl]-5-oxopyrrolidine-2-carbonyl}-4-fluoropyrrolidine-2-carbonitrile

2-[(3S,5S)-5-{[(2S)-2-Cyanopyrrolidin-1-yl]carbonyl}-2-oxopyrrolidin-3-yl]-N-phenylacetamide

2S)-1-({(2S,4S)-4-[2-(6,7-Dihydrothieno[3,2-c]pyridin-5(4H)-yl)-2-oxoethyl]-5-oxopyrrolidin-2-yl}carbonyl)pyrrolidine-2-carbonitrile

(2S)-1-({(2S,4S)-4-[2-(5-Trifluoromethyl-1,3-dihydro-2H-isoindol-2-yl)-2-oxoethyl]-5-oxopyrrolidin-2-yl}carbonyl)pyrrolidine-2-carbonitrile

(2S)-1-({(2S,4S)-4-[2-[4-(4-Fluorophenyl)piperazin-1-yl]-2-oxoethyl]-5-oxopyrrolidin-2-yl}carbonyl)pyrrolidine-2-carbonitrile

(2S)-1-((2S)-4-(2-(isoindolin-2-yl)-2-oxoethyl)-5-oxopyrrolidine-2-carbonyl)pyrrolidine-2-carbonitrile