(2S,4R)-1-p-Nitrobenzyloxycarbonyl-2-dimethylaminocarbonyl-4-hydroxypyrrolidine

4-Nitrobenzyl (2S,4S)-4-(acetylthio)-2-[(dimethylamino)carbonyl]pyrrolidine-1-carboxylate

2-Azetidinebutanoic acid, 3-[(1R)-1-hydroxyethyl]-γ-methyl-β,4-dioxo-, (4-nitrophenyl)methyl ester, (γR,2R,3S)-

(2S,4R)-2-dimethylaminocarbonyl-4-mesyloxy-1-p-nitrobenzyloxycarbonylpyrrolidine