Cinnoline

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What Wikipedia says

Cinnoline is an aromatic heterocyclic compound with the formula C8H6N2. It is isomeric with other naphthyridines including quinoxaline, phthalazine and quinazoline. Neither the unsubstituted heterocycle nor any derivatives is known to occur naturally.

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

Image: Edgar181, Public domain, via Wikimedia Commons.