Canavanine

Rarity: Common

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What Wikipedia says

L-(+)-(S)-Canavanine is a non-proteinogenic amino acid found in certain leguminous plants. It is structurally related to the proteinogenic α-amino acid L-arginine, the sole difference being the replacement of a methylene bridge (−CH2− unit) in arginine with an oxa group (i.e., an oxygen atom) in canavanine.

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

Image: Homer Landskirty, Public domain, via Wikimedia Commons.