1-[(3S,5S)-3,5-Bis-(tert-butyl-dimethyl-silanyloxy)-piperidin-1-yl]-2-[(1R,3aS,7aR)-1-((R)-5-methoxymethoxy-1,5-dimethyl-hexyl)-7a-methyl-octahydro-inden-(4E)-ylidene]-ethanone

5-(tert-butoxycarbonyl)amino-1-O-(tert-butyldimethyl)silyl-5-deoxy-4-O-formyl-2,3-O-isopropylidene-β-D-xylulofuranose

5-(tert-butoxycarbonyl)amino-5-deoxy-4-O-formyl-2,3-O-isopropylidene-1-O-pivaloyl-β-D-xylulofuranose