5-(4-Ethyl-phenyl)-thiophene-2-carboxylic acid methyl-[(S)-1-((R)-3-methylamino-pyrrolidine-1-carbonyl)-pyrrolidin-3-yl]-amide

(S)-3-(tert-Butoxycarbonyl-methyl-amino)-pyrrolidine-1-carboxylic acid 4-nitro-phenyl ester

Methyl-{(S)-1-[(R)-3-(2,2,2-trifluoro-acetylamino)-pyrrolidine-1-carbonyl]-pyrrolidin-3-yl}-carbamic acid tert-butyl ester

5-(4-Ethyl-phenyl)-thiophene-2-carboxylic acid methyl-((S)-1-{(R)-3-[methyl-(2,2,2-trifluoro-acetyl)-amino]-pyrrolidine-1-carbonyl}-pyrrolidin-3-yl)-amide

Methyl-((S)-1-{(R)-3-[methyl-(2,2,2-trifluoro-acetyl)-amino]-pyrrolidine-1-carbonyl}-pyrrolidin-3-yl)-carbamic acid tert-butyl ester

2,2,2-Trifluoro-N-methyl-N-[(R)-1-((S)-3-methylamino-pyrrolidine-1-carbonyl)-pyrrolidin-3-yl]-acetamide