Source:http://linkedlifedata.com/resource/umls/id/C0034435
MSH: Hydrocarbon rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups.,CSP: benzene ring with 2 para keto groups.,NCI: A class of organic compounds with the base structure of quinone, an aromatic benzene molecule containing a double ketone functional group.