methyl (3aR,4R,6aS)-4-((S,E)-5-methoxyhept-2-en-1-yl)-5',5'-dimethyl-5-oxohexahydro-1H-spiro[pentalene-2,2'-[1,3]dioxane]-4-carboxylate

(3aR,4S,6aS)-4-((S)-5-methoxyheptyl)-5',5'-dimethyltetrahydro-1H-spiro[pentalene-2,2'-[1,3]dioxan]-5(3H)-one

(3aS,4R,6aS)-4-((S)-5-methoxyheptyl)-5',5'-dimethylhexahydro-1H-spiro[pentalene-2,2'-[1,3]dioxane]

(3aS,4S,6aS)-4-((S)-5-methoxyheptyl)-5',5'-dimethylhexahydro-1H-spiro[pentalene-2,2'-[1,3]dioxane]

(3aR,4S,5S,6aS)-4-((S)-5-methoxyheptyl)-5',5'-dimethylhexahydro-1H-spiro[pentalene-2,2'-[1,3]dioxan]-5-ol