(1R,4R,5S,6R)-5-[1,3]Dioxolan-2-yl-6-methyl-bicyclo[2.2.1]heptan-2-one

(1R,5R,6S,7R)-6-[1,3]Dioxolan-2-yl-7-methyl-2-oxa-bicyclo[3.2.1]octan-3-one

((1S,2R,3S,4S)-2-[1,3]Dioxolan-2-yl-4-hydroxy-3-methyl-cyclopentyl)-acetic acid methyl ester

(5R, 6S)-5-endo-hydroxymethyl-6-exo-methylbicyclo<2.2.1>-2-heptanone