(+)-(4R,cis)(Z)-2,2-dimethyl-5-(4-carbethoxy-1-butenyl)-1,3-dioxolane-4-methanol

(-)-(1S,5R)-3,3-dimethyl-8-(3-carbethoxy-1-propyl)-7-aza-2,4-dioxabicyclo(3.3.0)oct-7-ene

(+)-(4R,cis)(Z)-2,2-dimethyl-5-(4-carbethoxy-1-butenyl)-1,3-dioxolane-4-methanol p-toluenesulfonate

(1S,2R,8aS)-1,2-(cyclohexylidenedioxy)-8-(hydroxymethyl)-8-hydroxyindolizidine

(1S,2R,8R,8aR)-1,2-(cyclohexylidenedioxy)-8-(ethoxycarbonyl)indolizidine