Guaiazulene

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What Wikipedia says

Guaiazulene, also azulon or 1,4-dimethyl-7-isopropylazulene, is a dark blue crystalline hydrocarbon. A derivative of azulene, guaiazulene is a bicyclic sesquiterpene that is a constituent of some essential oils, mainly oil of guaiac and chamomile oil, which also serve as its commercial sources.

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

Image: Jü, Public domain, via Wikimedia Commons.