Naphthenic acid

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What Wikipedia says

Naphthenic acids (NAs) are mixtures of several cyclopentyl and cyclohexyl carboxylic acids with molecular weights of 120 to well over 700 atomic mass units. The main fractions are carboxylic acids with a carbon backbone of 9 to 20 carbons.

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

Image: Roland Mattern, Public domain, via Wikimedia Commons.