(2R,3R,4S)-2-Hydroxymethyl-3,4-dihydro-2H-pyrrole-3,4-diol

1-amino-1,4-anhydro-N-tert-butoxycarbonyl-1-deoxy-2,3-O-isopropylidene-5-O-methanesulfonyl-D-ribitol

N-(tert-butyloxycarbonyl)-5-O-methanesulfonyl-4-deoxy-2,3-O-isopropylidene-D-ribono-1,4-lactam

4-amino-N-(tert-butoxycarbonyl)-4-deoxy-2,3-O-isopropylidene-D-ribofuranose