ethyl (2R,5R)-5-hydroxy-8,8-dimethyl-7,9-dioxatricyclo[4.3.0.0^[2,4]]nonane-2-carboxylate

(1R,2S,5S,3R,4R)-1-ethoxycarbonyl-4-cyano-2,3-O-isopropylidene-2,3-dihydroxybicyclo[3.1.0]hexane

(1R,2S,4S,5S,3R)-1-ethoxycarbonyl-4-formyl-2,3-O-isopropylidene-2,3-dihydroxybicyclo[3.1.0]hexane

(1R,2S,5S,3R,4R)-1-ethoxycarbonyl-2,3-O-isopropylidene-2,3-dihydroxy-4-(hydroxymethyl)bicyclo[3.1.0]hexane

ethyl (2R,5R)-5-[[(tert-butyldiphenylsilyl)oxy]methyl]-8,8-dimethyl-7,9-dioxatricyclo[4.3.0.02,4]nonane-2-carboxylate