(1R,3R,5S,8S)-3-(tert-butyldimethylsilyloxy)-8-methyl-2-methylene-8-vinyl-6-oxabicyclo[3.2.1]octan-7-one

(4S)-4-[(tert-butyldimethylsilyl)oxy]-3-methyl-cyclohex-2-en-1-one

(S)-4-hydroxy-3-methyl-cyclohex-2-en-1-one