Uroporphyrinogen III

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What Wikipedia says

Uroporphyrinogen III is a tetrapyrrole, the first macrocyclic intermediate in the biosynthesis of heme, chlorophyll, vitamin B12, and siroheme. It is a colorless compound, like other porphyrinogens.

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

Image: Fvasconcellos 15:10, 14 May 2007 (UTC), Public domain, via Wikimedia Commons.