(2R)-6-hydroxy-2-(3-tert-butyldimethylsilyloxypropyl)-2H-pyran-3(6H)-one

tert-butyl (6R)-5,6-dihydro-6-(3-tert-butyldimethylsilyloxypropyl)-5-oxo-2H-pyran-2-yl carbonate

(2R,6S)-6-(benzyloxy)-2-(3-tert-butyldimethylsilyloxypropyl)-2H-pyran-3(6H)-one

(2R,3S,6S)-3-azido-6-(benzyloxy)-3,6-dihydro-2-(3-tert-butyldimethylsilyloxypropyl)-2H-pyran

(2R,3S,6S)-6-(benzyloxy)-3,6-dihydro-2-(3-tert-butyldimethylsilyloxypropyl)-2H-pyran-3-yl methyl carbonate