Compounds having a fully conjugated cyclic dione structure, such as that of benzoquinones, derived from @A00441@ compounds by conversion of an even number of number of –CH= groups into –C(=O)– groups with any necessary @R05194@ of double bonds (polycyclic and heterocyclic analogues are included).
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1362 [Terms] [Paper]