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

(4R,6aS)-5,5,6a-Trimethyl-4-(3-methyl-but-3-enyl)-2-oxo-octahydro-pentalene-1-carboxylic acid methyl ester

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

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

isopentenylmagnesium bromide