methyl 1,2,4,6,6a,7,8,9-octahydro-2-methoxy-8,8-dimethylpentaleno<1,6a-c>pyran-5-carboxylate

4',5',6',6'a-tetrahydro-5',5'-dimethyl-3'-<(vinyloxy)methyl>spiro<1,3-dioxolane-2,2'(1'H)-pentalene>

methyl 1,2,4,6,6a,7,8,9-octahydro-8,8-dimethyl-2-oxopentaleno<1,6a-c>pyran-5-carboxylate

(2S,4aS,6aS,9aR)-octahydro-2-methoxy-8,8-dimethylpentaleno<1,6a-c>pyran-5(6H)-one

(4aR,6aR,9aS)-2-Hydroxy-8,8-dimethyl-octahydro-pentaleno[1,6a-c]pyran-5-one