A diene molecule with a double bond at the first and third carbon atoms.
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3-<(p-Octylphenyl)thio>-2,5-dihydrothiophene 1,1-dioxide
4-(4-Nitro-phenyl)-1,2,3,3a,4,6,7,8-octahydro-dicyclopenta[c,e]pyridazine