(1R,4R,5R,8R)-4,5-dibromo-10,10-dimethyl-9,11-dioxabicyclo[6.3.0]undecane

(1R,4S,5S,8R)-4,5-dibromo-10,10-dimethyl-9,11-dioxabicyclo[6.3.0]undecane

(1R,2R,5R)-9-oxabicyclo[3.3.1]-non-6-en-2-ol

(1R,2R,5R,6S)-5-bromo-9-oxabicyclo[4.2.1]-nonan-2-ol

(1R,2R,5R,6S)-6-bromo-9-oxabicyclo[3.3.1]-nonan-2-ol