4-cyclohexyl-2-hydroxy-3-((2-((2-(1-oxo-1,3-dihydroisoindol-2-yl)-3-phenylpropionyl)amino)pentanoyl)amino)butyric acid isopropyl ester, 2(S)-hydroxy isomer
4-cyclohexyl-2-hydroxy-3-((2-((2-(1-oxo-1,3-dihydroisoindol-2-yl)-3-phenylpropionyl)amino)pentanoyl)amino)butyric acid isopropyl ester, 2(s)-hydroxy isomer