tert-butyl (S)-(1-(benzylamino)pent-4-en-2-yl)carbamate

tert-butyl (S)-2-allyl-4-benzyl-5-oxopiperazine-1-carboxylate

tert-butyl (2S,6S)-6-allyl-4-benzyl-2-((1S,2S)-2-((tert-butoxycarbonyl)amino)-3-(3,5-difluorophenyl)-1-hydroxypropyl)-3-oxopiperazine-1-carboxylate

tert-butyl [(1S)-1-(3,5-difluorobenzyl)-2-hydroxyethyl]carbamate

(S)-[1-(3,5-difluorobenzyl)-2-oxo-ethyl]-carbamic acid tert-butyl ester