Malonic anhydride

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What Wikipedia says

Malonic anhydride or oxetane-2,4-dione is an organic compound with chemical formula C3H2O3 or CH2(CO)2O. It can be viewed as the anhydride of malonic acid, or a double ketone of oxetane.

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

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