Rhodizonic acid

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What Wikipedia says

Rhodizonic acid is a chemical compound with formula H2C6O6 or (CO)4(COH)2. It can be seen as a twofold enol and fourfold ketone of cyclohexene, more precisely 5,6-dihydroxycyclohex-5-ene-1,2,3,4-tetrone.

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

Image: User_talk:Ronhjones, Public domain, via Wikimedia Commons.