5-(bicyclo[2.2.1]hept-2'-en-7'-ylidene)-2,2-dimethyl-1,3-dioxan-4,6-dione

3,4-二亚甲基环丁-1-烯

cis-1,3-hexadien-5-yne

1,3-己二烯-5-炔.

苯基乙烯醚