(4S)-4-[(tert-butyldiphenylsilyloxy)methyl]-2,2-dimethylcyclobutan-1-one

(1R,4S)-4-[(tert-butyldiphenylsilyloxy)methyl]-2,2-dimethylcyclobutan-1-ol

(1R,4S,5S)-4-[(E)-(1S,2S)-6-(tert-Butyl-diphenyl-silanyloxy)-1-hydroxy-2-methoxy-4-methyl-hex-3-enyl]-7,7-dimethyl-2-oxa-bicyclo[3.2.0]heptan-3-one