(2S,4R)-1-((S)-2-((tert-Butoxycarbonyl)amino)-3-methylbutanoyl)-4-hydroxypyrrolidine-2-carboxylic acid

(2S,4R)-1-((S)-2-((tert-Butoxycarbonyl)amino)-3-methylbutanoyl)-4-hydroxypyrrolidine-2-carboxylic acid,