Aloin

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What Wikipedia says

Aloin, also known as barbaloin, is a bitter, yellow-brown colored compound noted in the exudate of at least 68 Aloe species at levels from 0.1 to 6.6% of leaf dry weight (making between 3% and 35% of the total exudate), and in another 17 species at indeterminate levels [Reynolds, 1995b].

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

Image: Jeff Dahl, Public domain, via Wikimedia Commons.