(1S,4R,5R,7R,8R)-4,8-dimethyl-2,2-ethylenedioxy-7-hydroxybicyclo[3.3.0]octane

(1R,4R,5R,8S)-4,8-dimethylbicyclo[3.3.0]octan-2-one

(1R,4S,5R,8S)-4,8-dimethyl-2-trimethylsilyloxybicyclo[3.3.0]oct-2-ene