http://bonap.net/MapGallery/County/Magnolia%20grandiflora.png
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Isolation and characterization of the sesquiterpene lactones costunolide, parthenolide, costunolide diepoxide, santamarine, and reynosin from Magnolia grandiflora L. Farouk S. El-Feraly and Yee-Ming Chan, Journal of Pharmaceutical Sciences, March 1978, Volume 67, Issue 3, pages 347–350, doi:10.1002/jps.2600670319
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