5,5-Dimethyl-4-(3-methyl-but-3-enyl)-2-oxo-2,3,3a,4,5,6-hexahydro-pentalene-1-carboxylic acid methyl ester

(3aS,6S)-3a,5,5-Trimethyl-6-(3-methyl-but-3-enyl)-hexahydro-pentalen-2-one

Trimethyl-[(4S,6aS)-5,5,6a-trimethyl-4-(3-methyl-but-3-enyl)-1,3a,4,5,6,6a-hexahydro-pentalen-2-yloxy]-silane

4-[(1S,2S)-3,3-Dimethyl-2-(3-methyl-but-3-enyl)-5-oxo-cyclopentyl]-3-oxo-butyric acid methyl ester

Trimethyl-[(3aR,6S)-3a,5,5-trimethyl-6-(3-methyl-but-3-enyl)-1,3a,4,5,6,6a-hexahydro-pentalen-2-yloxy]-silane