(1R,6S,7R,8S)-3,3-dimethyl-2,4-dioxa-7-(2-propenyl)bicyclo[4.3.0]nonan-8-ol

2-{(1R,6S)-6-[(1E)-1,3-butadienyl]-3,3-dimethyl-2,4-dioxacyclohexyl}ethanol

(4R,5S)-4-{5-[(1E)-1,3-butadienyl]}-4-(2-tert-butyldimethylsilyloxyethyl)-2,2-dimethyl-1,3-dioxa-cyclohexane

(1R,6S,7R,8S)-8-tert-butyldimethylsilyloxy-3,3-dimethyl-2,4-dioxa-7-(2-propenyl)-bicyclo[4.3.0]nonan-8-ol