乙酸酐

(1R,5R)-5-hydroxymethyl-2-cyclopenten-1-ol

(1R,2S,3S,4S)-2-acetoxy-1-(acetoxymethyl)-3,4-di-O-thionocarbonylcyclopentane

(3S,3aS,6aR)-2-oxo-3,3a,4,6a-tetrahydro-2H-cyclopenta[b]furan-3-yl (S)-2-acetoxypropanoate

1,2:5,6-di-O-isopropylidene-3-deoxy-3β-allyl-α-D-glucofuranose