(1R,4S)-2,2-dimethyl-4-[(p-toluenesulfonyloxy)methyl]lcyclobutan-1-ol

(1R,4S)-4-hydroxymethyl-2,2-dimethylcyclobutan-1-ol

(1R,5S)-7,7-Dimethyl-2-oxa-bicyclo[3.2.0]heptan-3-one

[(1S,2R)-2-(2-Ethoxy-ethoxy)-3,3-dimethyl-cyclobutyl]-acetonitrile

Toluene-4-sulfonic acid (1S,2R)-2-(2-ethoxy-ethoxy)-3,3-dimethyl-cyclobutylmethyl ester