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

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

tetrahydro-5',5'-dimethyl-3'-methylenespiro<1,3-dioxolane-2,2'(1'H)-pentalene>-3'a(3'H)-acetaldehyde

(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