<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>Hydrocarbon rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups.</n0:def-definition><n0:def-source>MSH2002_06_01</n0:def-source></n0:ComplexDefinition>
<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A class of organic compounds with the base structure of quinone, an aromatic benzene molecule containing a double ketone functional group.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>