(1R,5R,7S,8R)-7-Bromomethyl-5-[(S)-2-(tert-butyl-dimethyl-silanyloxy)-but-3-ynyl]-8-(tert-butyl-dimethyl-silanyloxymethyl)-4,7-dimethyl-6-oxa-bicyclo[3.2.1]oct-3-ene

(5R,6R)-6-(hydroxymethyl)-2-methyl-5-(1-methylethenyl)-2-cyclohexen-1-one

(5R,6R)-6-[(1,1-dimethylethyl)dimethylsilyloxymethyl]-2-methyl-5-(1-methylethenyl)-2-cyclohexen-1-one