HCCH CHCHCH CH,CCHOCCH 戊二醛 2,4戊二酮(乙酰丙酮) CH3CH=CHCHO CH3CHCHECHCHO CH 2-丁烯醛(巴豆醛) 4-甲基-2-戊烯醛 CH3- CHCCH3 3-己烯-2,5-二酮HCCH2 CH2 CH2 CH O O CH3 CCH2 CCH3 O O 2,4-戊二酮 (乙酰丙酮) CH3 CH CHCHO 4-甲基-2-戊烯醛 3-己烯-2,5-二酮 戊二醛 2-丁烯醛(巴豆醛) CH3 CHCH CHCHO CH3 CH3 CCH CHCCH3 O O