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|2S,5R-[[Chalcogran]]: Et [[feromon]] fra [[barkbille]]n [[Pityogenes chalcographus]] <ref>{{cite journal |last=Byers |first=J. A. |last2=Birgersson |first2=G. |last3=Löfqvist |first3=J. |last4=Appelgren |first4=M. |last5=Bergström |first5=G. |title= Isolation of pheromone synergists of bark beetle, Pityogenes chalcographus, from complex insect-plant odors by fractionation and subtractive-combination bioassay |journal=Journal of Chemical Ecology |year=1990 |volume=16 |issue=3 |pages=861–76 |url=http://www.chemical-ecology.net/pdf/Byersetal1990a.pdf |accessdate=
|[[Image:2S,5R-chalcogran-skeletal.svg|130px|''(2S,5R)-2-ethyl-1,6-dioxaspiro[4.4]nonane'']]
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