 The molecular orbitals of the carbon atoms in these systems are to some extent pyramidalized resulting a different pi electron density on either side of the molecule with consequences for reactivity.One member of this group of organic compounds, "pentaindenocorannulene" (depicted below), can be considered a large fullerene fragment.The experimentally obtained curvature and degree of pyramidalizion (12.6° for the carbons of the pentagon at the center ) are both actually larger than that of fullerene but according to its discoverers, the compound is relatively easy to synthesize starting from corannulene and a way is opened to produce larger such fragments by stitching.