referring to a double bond between two carbon atoms
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(3aR)-4α-Acetoxy-3aβ,4,5,5a,6,7,8,9bα-octahydro-6α-hydroxy-5aα,9-dimethyl-3-methylenenaphtho[1,2-b]furan-2(3H)-one
1-((E)-2-Chloro-ethenesulfinyl)-4-trifluoromethyl-benzene
N-(4-phenylbut-1-en-2-yl)acetamide
4'-fluorocrotonyl anilate