2,5-Dibromo-2,5-dimethylcyclopentanon

(E,E)-2-methylhexa-2,4-dienal

2-methyl-2,4-hexadienal dimethyl acetal

(E)-1-(6,6-dimethoxy-5-methylhex-3-en-2-yl)piperidine

2,5-二甲基-环戊酮