3-ethyl-pent-4-en-2-one

(4E)-3-甲基-4-己烯-2-酮

3,4-二甲基-3-戊烯-2-酮

3,4-dimethylpent-4-en-2-one

4-(2,2-dimethyl-propyl)-6,6-dimethyl-hept-3-en-2-one