Not less than-95.0%
(S)-1-(((S)-1-Ethoxy-1-oxopentan-2-yl)-L-alanyl)-2,3,4,5,6,7-hexahydro-1H-indole-2-carboxylic Acid; 1H-Indole-2-carboxylic acid, 1-[(2S)-2-[[(1S)-1-(ethoxycarbonyl)butyl]amino]-1-oxopropyl]-2,3,4,5,6,7-hexahydro-, (2S)