(3aR*,4R*)-5,5-dimethyl-4-(2-tetrahydropyranyloxy)ethyl-3a,4,5,6-tetrahydro-2(3H)-pentalenone

2-acetonyl-4,4-dimethylcyclopent-2-en-1-one

(2R*,3R*)-2-acetonyl-4,4-dimethyl-3-(2-hydroxyethyl)cyclopentan-1-one

methyl (1R*,3aR*,4S*,6aR*)-2,2-dimethyl-2,3,3a,4,6,6a-hexahydro-5-oxo-4-phenylthiomethyl-1-(2-tetrahydropyranyloxy)ethyl-3a(1H)pentaleneacetate

methyl 5-(1,3-dioxolan-2-yl)-5-methyl-3-oxohexanoate