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Keto–enol tautomerism: keto form of acyclic 1,3-dicarbonyl compound 20, enol form of acyclic 1,3-dicarbonyl compound 21 representing intramolecular hydrogen bonds, cyclic 1,3-diketone 22, twist form of cyclic 1,3-dicarbonyl compound 23, intermolecular hydrogen bonds between two cyclic 1,3-diketones 24 and Vorländer adduct 25.
