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Overview of compounds formed in beer during storage <ref name="Vanderhaegen_2006" />:
* Linear aldehydes: acetaldehyde, trans-2-octenal, trans-2-nonenal, derivatives of nonadienal and decadienal.
* Strecker aldehydes: 2 and 3-methyl-butanal, 2-phenylacetaldehyde, benzaldehyde, 3-(methylthio)propionaldehyde (also known as methional).
* Ketones: trans-beta-damascenone, 3-methyl-2-butanone, 4-methyl-2-butanone, 4-methyl-2-pentanone, diacetyl, 2,3-pentanedione.
* Cyclic acetals: 2,4,5-trimethyl-1,3-dioxolane, 2-isopropyl-4,5-dimethyl-1,3-dioxolane, 2-isobutyl-4,5-dimethyl-1,3-dioxolane, 2-sec butyl-4,5-dimethyl-1,3-dioxolane.