(R)-5-Oxo-1-((3aR,4R,7aR)-2,2,7-trimethyl-3a,7a-dihydro-4H-1,3,5-trioxa-6-aza-inden-4-yl)-pyrrolidine-2-carboxylic acid tert-butyl ester

5-deoxy-2,3-O-isopropylidene-1,4-di-O-methanesulfonyl-D-ribitol

1,4,5-trideoxy-N-hydroxy-1,4-imino-2,3-O-isopropylidene-L-lyxitol