(2S,4R)-4-hydroxy-1-((S)-2-(3-methoxypropanamido)propanoyl)-N-(4-(4-methylthiazol-5-yl)benzyl)pyrrolidine-2-carboxamide

(2S,4R)-4-hydroxy-1-(2-(3-methoxypropanamido)-2-methylpropanoyl)-N-(4-(4-methylthiazol-5-yl)benzyl)pyrrolidine-2-carboxamide

(2S,4R)-1-(2-amino-2-methylpropanoyl)-4-hydroxy-N-(4-(4-methylthiazol-5-yl)benzyl)pyrrolidine-2-carboxamide

(2S,4R)-1-((S)-2-(N,3-dimethyloxetane-3-carboxamido)propanoyl)-4-hydroxy-N-(4-(4-methylthiazol-5-yl)benzyl)pyrrolidine-2-carboxamide

(2S,4R)-1-((S)-2-(3-ethoxybenzamido)propanoyl)-4-hydroxy-N-(4-(4-methylthiazol-5-yl)benzyl)pyrrolidine-2-carboxamide