Referring to a molecule with alternating single and double bonds that are not in the same plane.
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diethyl 2,5-dibromo-3,6-dihydroxybenzene-1,4-dicarboxylate
(2E,4E,7E,9Z)-6-[1-Phenyl-meth-(E)-ylidene]-undeca-2,4,7,9-tetraenedioic acid dimethyl ester
