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Humulene
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<p>Humulene, also known as α-humulene or α-caryophyllene, is a naturally occurring monocyclic <a href="/facts/Sesquiterpene/rFJG50mL">sesquiterpene</a> (C15H24), containing an 11-membered ring and consisting of 3 <a href="/facts/Isoprene/8ArKUyzT">isoprene</a> units containing three nonconjugated C=C double bonds, two of them being triply substituted and one being doubly substituted. It was first found in the <a href="/facts/Essential_oil/cq8V5ocP">essential oils</a> of <i><a href="/facts/Humulus_lupulus/Qaceb20f">Humulus lupulus</a></i> (<a href="/facts/Hops/mBRf6xGx">hops</a>), from which it derives its name. Humulene is an <a href="/facts/Isomer/PXlvDVdg">isomer</a> of <a href="/facts/Caryophyllene/3lqoJWGW">β-caryophyllene</a>, and the two are often found together as a mixture in many aromatic plants. </p>