(1R,4S,5R)-1,4-Dihydroxy-6-oxa-bicyclo[3.2.1]octane-3,7-dione

(1S,3R,4R,5S,6S)-6-chloro-1,4,5-trihydroxycyclohexane-1,3-carbolactone

(1S,3R,4R,5S,6S)-6-chloro-1-hydroxy-4,5-(isopropylidenedioxy)cyclohexane-1,3-carbolactone

methyl (1S,2S,3S,4S,5R)-2-chloro-1,5-dihydroxy-3,4-(isopropylidenedioxy)cyclohexanecarboxylate

(1S,3R,4R,5S,6S)-4-(tert-butyldimethylsiloxy)-6-chloro-1,5-dihydroxycyclohexane-1,3-carbolactone