Kalmar "benzene nucleus" tana nufin ainihin tsarin kwayoyin benzene, wanda ya ƙunshi ƙwayoyin carbon guda shida da aka shirya a cikin zoben hexagonal na planar tare da musanya biyun shaidu. Ana amfani da tsakiya na benzene sau da yawa a matsayin ginshiƙi don gina wasu mahadi masu kamshi, waɗanda ke raba kayan gini iri ɗaya da na lantarki. An yi amfani da kalmar “nucleus” don bayyana tsakiyar sashin kwayoyin halitta, wanda ke kewaye da wasu atom ko rukunin atom da za a iya manne da shi.