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

[(S)-1-((2R,5R)-5-Hydroxymethyl-tetrahydro-furan-2-yl)-ethyl]-carbamic acid tert-butyl ester

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

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

2,4,6-Triisopropyl-benzenesulfonic acid (2S,5R,6S)-6-tert-butoxycarbonylamino-2,5-dihydroxy-heptyl ester