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Acetonedicarboxylic acid anhydride from acetonedicarboxylic acid. en Formation of acetondicarboxylic acid anhydride tetrahydropyran trione from acetondicarboxylic acid and further acetylation Kiang Tan and Wong Reactions of acetonedicarboxylic anhydride tetrahydropyrantrione and its mono and diacetyl derivatives with amines Chem