1,2-Dioxetanedione

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What Wikipedia says

The chemical compound 1,2-dioxetanedione, or 1,2-dioxacyclobutane-3,4-dione, often called peroxyacid ester, is an unstable oxide of carbon (an oxocarbon) with formula C2O4. It can be viewed as a double ketone of 1,2-dioxetane (1,2-dioxacyclobutane), or a cyclic dimer of carbon dioxide.

Excerpt from the Wikipedia article “1,2-Dioxetanedione”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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