Pyridine-N-oxide

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What Wikipedia says

Pyridine-N-oxide is the heterocyclic compound with the formula C5H5NO. This colourless, hygroscopic solid is the product of the oxidation of pyridine. Its synthesis was first reported by Jakob Meisenheimer, who used peroxybenzoic acid as the oxidant.

Excerpt from the Wikipedia article “Pyridine-N-oxide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jynto (talk), CC0, via Wikimedia Commons.