N-cinnamoyl-L-proline-L-leucine

(S)-1-((R)-3-Phenyl-heptanoyl)-pyrrolidine-2-carboxylic acid

methyl N-(N-cinnamoyl-(L)-prolyl)-3-phenylaziridine-2-carboxylic acid

(S)-2-{[(S)-1-((2R,3R)-3-Azido-2-hydroxy-3-phenyl-propionyl)-pyrrolidine-2-carbonyl]-amino}-4-methyl-pentanoic acid methyl ester

(S)-4-Methyl-2-({(S)-1-[(4R,5S)-5-phenyl-2-((E)-styryl)-4,5-dihydro-oxazole-4-carbonyl]-pyrrolidine-2-carbonyl}-amino)-pentanoic acid methyl ester