5-(2,6,6-trimethyl-3-oxo-1-cyclohexen-1-yl)-3-methyl-3-hydroxy-1,4-pentadiene

4'-hydroxy-β,β-caroten-4-one

(2E,4Z)-5-(2,6,6-trimethyl-3-oxo-1-cyclohexen-1-yl)-1-hydroxy-2,4-pentadiene

3-((1Z,3E)-5-bromo-3-methylpenta-1,3-dien-1-yl)-2,4,4-trimethylcyclohex-2-en-1-one

4'-acetylthio-β,β-carotene