L-古洛糖酸-γ-内酯

2,3,4,5-tetra-O-tert-butyldimethylsilyl-L-xylose

D-threo-Hex-5-en-2-ulose, 5,6-dideoxy-

5,6-di-O-isopropylidene-D-glucono-1,4-lactone