4-Hydroxyphenylpyruvic acid

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What Wikipedia says

4-Hydroxyphenylpyruvic acid (4-HPPA) is an intermediate in the metabolism of the amino acid phenylalanine. The aromatic side chain of phenylalanine is hydroxylated by the enzyme phenylalanine hydroxylase to form tyrosine. The conversion from tyrosine to 4-HPPA is in turn catalyzed by tyrosine aminotransferase.

Excerpt from the Wikipedia article “4-Hydroxyphenylpyruvic acid”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Fvasconcellos 17:54, 27 May 2007 (UTC), Public domain, via Wikimedia Commons.