(5S,6R)-6-(tert-butyldimethylsilanyloxy)-5-[(R)-1-(tert-butyldimethylsilanyloxy)allyl]non-8-ynnitrile

1,2-O-isopropylidene-5-O-2,2-dimethylpropanoyl-α-D-erythro-pent-3-ulofuranose

3-deoxy-1,2-O-isopropylidene-3-C-methylene-5-O-pivaloyl-α-D-xylopentofuranoside

benzyl 3-deoxy-3-C-methylene-5-O-pivaloyl-α-D-xylopentofuranoside

benzyl 3-deoxy-3-C-methylene-5-O-pivaloyl-α-D-lyxo-pentofuranoside