(S)-5-benzyl-4-ethoxy-1H-pyrrol-2(5H)-one

(2R,3S)-tert-butyl 2-benzyl-3-hydroxy-5-oxopyrrolidine-1-carboxylate

(2S,3S)-2-Benzyl-1-(tert-butyloxycarbonyl)pyrrolidin-3-ol

(2S,3R)-3-Acetoxy-2-benzyl-pyrrolidine-1-carboxylic acid tert-butyl ester

Acetic acid (2S,3R)-2-benzyl-1-((S)-2-benzyloxycarbonylamino-3-methyl-butyryl)-pyrrolidin-3-yl ester