tert-butyl (S)-4-((R)-3-((tert-butyldiphenylsilyl)oxy)-2-methylpropyl)-2,2-dimethyloxazolidine-3-carboxylate

ethyl (2S,3R)-2-((S)-2-((tert-butoxycarbonyl)amino)propanamido)-3-hydroxy-3-phenylpropanoate