One of the mysteries of the English language finally explained.
A colourless, soluble, solid compound which is a metabolic precursor of porphyrins, is excreted in the commoner forms of porphyria, and is a substituted pyrrole; 5-aminomethyl-4-carboxymethyl-1H-pyrrole-3-propanoic acid, C₁₀H₁₄N₂O₄.
1930s; earliest use found in Chemical Abstracts. From German Porphobilinogen from Porphobilin + -ogen.
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