Helenalin

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Helenalin, or (-)-4-Hydroxy-4a,8-dimethyl-3,3a,4a,7a,8,9,9a-octahydroazuleno[6,5-b]furan-2,5-dione, is a toxic sesquiterpene lactone which can be found in several plants such as Arnica montana and Arnica chamissonis Helenalin is responsible for the toxicity of the Arnica spp.

Excerpt from the Wikipedia article “Helenalin”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Fvasconcellos 22:56, 4 January 2008 (UTC), Public domain, via Wikimedia Commons.