Arsanilic acid

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What Wikipedia says

Arsanilic acid, also known as aminophenyl arsenic acid or aminophenyl arsonic acid, is an organoarsenic compound, an amino derivative of phenylarsonic acid whose amine group is in the 4-position.

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

Image: Ben Mills, Public domain, via Wikimedia Commons.