(2S,3aS,7aS)-1-[(2S)-2-{[(2S)-1-ethoxy-1-oxopentan-2-yl]amino}propanoyl]octahydro-1H-indole-2-carboxylic acid
(2S,3aS,7aS)-1-((S)-N-((S)-1-Carboxybutyl)alanyl)hexahydro-2-indolinecarboxylic Acid, 1-ethyl Ester