Vanillic acid

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What Wikipedia says

Vanillic acid (4-hydroxy-3-methoxybenzoic acid) is a dihydroxybenzoic acid derivative used as a flavoring agent. It is an oxidized form of vanillin. It is also an intermediate in the production of vanillin from ferulic acid.

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

Image: NEUROtiker ⇌, Public domain, via Wikimedia Commons.