(2S,3S)-tert-butyldimethylsilyloxymethyl-2-ethynyl-2-methyl-1-(2-nitrobenzenesulfonyl)-aziridine

(R)-4-((R)-1-hydroxy-1-methylpropyl)-2,2-dimethyl oxazolidine-3-carboxylic acid tert-butyl ester

(2S,3R)-3-(4-benzyloxy-3-{(R)-1-[(S)-((R)-2-benzyloxycarbonylamino-3-methylbutyrylamino)-(tert-butoxycarbonylmethylcarbamoy)methyl]-1-methylprop-2-ynyloxy}phenyl)-2-(tert-butoxycarbonylmethylamino)-3-hydroxypropionic acid benzyl ester

(2S,3R)-[3-hydroxy-3-methyl-2-(2-nitrobenzenesulfonylamino)pent-4-ynoylamino]acetic acid tert-butyl ester

tert-butyl (R)-2,2-dimethyl-4-((R)-2-((trimethylsilyl)oxy)pent-3-yn-2-yl)oxazolidine-3-carboxylate