(4S)-1-(tert-butoxycarbonyl)-4-((methylsulfonyl)oxy)-L-proline benzyl ester

dimethyl (2S)-2-{N-[(tert-butoxy)carbonyl]benzyloxycarbonylamino}pentane-1,5-dioate

(4R,5S)-5-acetyl-2-oxo-4-phenyloxazolidine-3-carboxylic acid tert-butyl ester

tert-butyl ((2R,3R)-1,2-dihydroxyhexan-3-yl)carbamate

2-[2'-(N,N-di-tert-butoxycarbonylamino)phenyl]-1,3-dithiane