环丙乙炔

顺式-六氢茚满

cyclopent-2-en-1-yl 2,2-dimethyl-3-oxobutanoate

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

Spiro