Quadricyclane

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What Wikipedia says

Quadricyclane is a strained, multi-cyclic hydrocarbon with the formula CH2(CH)6. A volatile colorless liquid, it is highly strained molecule (78.7 kcal/mol). Isomerization of quadricyclane proceeds slowly at low temperatures.

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

Image: Rifleman 82, Public domain, via Wikimedia Commons.