3,4-二甲基-5,6-二氢-2(1H)-吡啶酮

2,3-dimethylcyclopentan-1-ol

3,5-二甲基-2-环己烯-1-酮

2,3,5-trimethylcyclopent-2-en-1-one

3-but-3-enyl-2,3-dimethylcyclopentan-1-one