(1S,3aR,4R,6aS)-4-Hydroxy-hexahydro-cyclopenta[c]pyrrole-1,2-dicarboxylic acid 2-benzyl ester 1-ethyl ester

L-Val-D-Val-OMe

(1S,3aR,4R,6aS)-4-Methoxymethoxy-octahydro-cyclopenta[c]pyrrole-1-carboxylic acid ethyl ester

(S)-3-Methyl-2-{(S)-3-methyl-2-[(pyrazine-2-carbonyl)-amino]-butyrylamino}-butyric acid methyl ester

(S)-3-Methyl-2-{(S)-3-methyl-2-[(pyrazine-2-carbonyl)-amino]-butyrylamino}-butyric acid