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Wikipedia definition
1. OxepinOxepin is an oxygen-containing heterocycle consisting of a seven-membered ring with three double bonds. It exists as an equilibrium mixture with benzene oxide. The oxepin-benzene oxide system has fluctuating bonds in which the equilibrium can be shifted to one extreme or the other by suitable substituents. This compound is not aromatic.
Read “Oxepin” on English Wikipedia
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Read “Oxepin” on DBpedia

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