4,5-Dimethyl-4-hexen-1-yn-3-one

carbon monoxide

5-iodo-4-methylhexa-1,4-diene

2,3-dimethyl-3-hydroxy-4-<(methoxymethyl)oxy>-1,4,5-hexatriene

(R)-2,3,5-trimethyl-5-((R)-phenylsulfinyl)cyclopent-2-en-1-one