https://doi.org/10.1351/goldbook.F02547
Compounds composed solely of an even number of carbon atoms, which form a @[email protected] fused-ring @[email protected] with twelve five-membered rings and the rest six-membered rings. The archetypal example is [60]fullerene, where the atoms and bonds delineate a truncated icosahedron. The term has been broadened to include any closed @[email protected] structure consisting entirely of three-coordinate carbon atoms.