(3aR,4aS,5R,8aR,8bR)-2,2-dimethyl-8-methylene-3a,4a,5,8,8a,8b-8bhexahydrobenzofuro[2,3-d][1,3]dioxol-5-ol

(3aR,5S,6R,6aR)-6-ethynyl-tetrahydro-2,2-dimethyl-5-((R)-oxiran-2-yl)furo[2,3-d][1,3]dioxole

(3aR,5S,6R,6aR)-6-(2,2-dibromovinyl)-5-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxole

(R)-1-((3aR,5S,6R,6aR)-6-ethynyl-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)ethane-1,2-diol

(3aR,5S,6R,6aR)-5-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-6-ethynyl-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxole