Tartronic acid

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What Wikipedia says

Tartronic acid or 2-hydroxymalonic acid is an organic compound with the structural formula of HOCH(CO2H)2. This dicarboxylic acid is related to malonic acid. It is a white solid. It is produced by oxidation of glycerol:

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

Image: Yikrazuul, Public domain, via Wikimedia Commons.