Androstenone

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What Wikipedia says

Androstenone (5α-androst-16-en-3-one) is a 16-androstene class steroidal pheromone. It is found in boar's saliva, celery cytoplasm, and truffle fungus. Androstenone was the first mammalian pheromone to be identified.

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

Image: Edgar181, Public domain, via Wikimedia Commons.