hexamethylbenzene dication
... that the pyramidal structure of the hexamethylbenzene dication has a central carbon atom bonded to an "unprecedented" six other carbon atoms?
... that the pyramidal structure of the <b id="mwAVk"><a href="./Hexamethylbenzene" id="mwAVo" rel="mw:WikiLink" title="Hexamethylbenzene">hexamethylbenzene dication</a></b> <i id="mwAVs">(pictured)</i> has a central carbon atom bonded to an "unprecedented" six other carbon atoms?