Toluene-4-sulfonic acid (S)-2-tert-butoxycarbonylamino-4-(tert-butyl-diphenyl-silanyloxy)-butyl ester

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

(2S,3R,4S)-2-Benzyl-3,4-dihydroxy-5-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester

((S)-1-Benzyl-2-oxo-tridec-3-ynyl)-carbamic acid tert-butyl ester