2-methyl-2-(3-oxopentyl)cyclohexane-1,3-dione

2-甲基-1,3-环己二酮

1-戊烯-3-酮

5,8a-二甲基-3,4,8,8a-四氢-1,6-(2H,7H)-萘二酮

1-氯-3-戊酮