S-tert-butyl (2R,3S)-2-benzyloxy-3-tert-butoxycarbonylamino-3-phenylpropanethioate

(2R,3S)-2-Acetoxy-3-azido-3-phenyl-propionic acid methyl ester

methyl (2R,3S)-2-acetoxy-3-bromo-3-phenylpropionate

(2R,3S)-3-acetylamino-2-hydroxy-3-phenylpropanoic acid isopropyl ester

methyl (2R,3S)-3-((tert-butoxycarbonyl)amino)-3-phenyl-2-((triisopropylsilyl)oxy)propanoate