(2R,5R)-5-((S)-1-tert-Butoxycarbonylamino-ethyl)-tetrahydro-furan-2-carboxylic acid

(3S,4S)-4-Dibenzylamino-1-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl)-pent-1-yn-3-ol

((1S,2S,5S)-2,5,6-Trihydroxy-1-methyl-hexyl)-carbamic acid tert-butyl ester

[(1S,2S)-4-((S)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-2-hydroxy-1-methyl-butyl]-carbamic acid tert-butyl ester

(2S,5R,1'S)-2-{1'-[(tert-butoxycarbonyl)amino]ethyl}-5-(hydroxymethyl)tetrahydrofuran