1-O-benzyl-8-O-tert-butyldiphenylsilyl-2,3,6-trideoxy-4,5-O-isopropylidene-α-L-erythro-oct-4-ulofuranose

1-O-benzyl-8-O-tert-butyldiphenylsilyl-2,3-dideoxy-4,5-O-isopropylidene-α-L-xylo-oct-4-ulofuranose

1-O-benzyl-8-O-tert-butyldiphenylsilyl-2,3-dideoxy-4,5-O-isopropylidene-6-O-<(methylthio)thiocarbonyl>-α-L-xylo-oct-4-ulofuranose