(1S,2R,3R)-1,2-dihydroxy-3-(2-hydroxyethyl)cyclopent-4-ene

methyl (1R,5R,8S)-3-oxo-2-oxabicyclo[3.3.0]oct-6-en-8-yl carbonate

(1R,5R,6S,7S,8S)-6,7,8-Triacetoxy-2-oxabicyclo[3.3.0]octan-3-one