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The structural analysis of khellinone and visnaginone indicated the planarity of the benzo[b]furan ring system. The oxygen or carbon atoms of the substituents, –OH, –OCH3, and –C(=O)CH3, are nearly coplanar with the aromatic ring. The molecular conformation is stabilized by the intramolecular O–H···O hydrogen bond formed between the ortho-substituted hydroxyl and acetyl groups. The intermolecular...
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