(1R*)-1-but-3-enyl-2,6,6-trimethyl-4-oxocyclohex-2-enecarboxylic acid ethyl ester

(1R*)-4-(tert-butyldimethylsilyloxy)-2,6,6-trimethyl-1-(3-oxobutyl)cyclohex-2-enecarboxylic acid ethyl ester

4-(4-((tert-butyldimethylsilyl)oxy)-1-(hydroxymethyl)-2,6,6-trimethylcyclohex-2-en-1-yl)butan-2-ol

(6R*)-9-(tert-butyldimethylsilyloxy)-7,11,11-trimethylspiro[5.5]undeca-1,7-dien-3-one