tert-butyl 3-oxohexanoate

7,11-dimethyldodeca-6,10-dien-4-one

3-(4-methylpent-3-enyl)-1-propylcyclopent-3-en-1-ol

ethyl 2-(hydroxymethylidene)butanoate

ethyl 2-(pyridine-3-carbonyl)butanoate