C(60)F(20): "Saturnene", an Extraordinary Squashed Fullerene This work was supported by a Joint Project Grant from the Royal Society, INTAS (grant no. 97-30027), NATO, and the Russian Programme, "Fullerene and Atomic Clusters". We thank Prof. P. W. Fowler for very helpful discussion, and B. de La Vaissièrre for the AM1, PM3, and MNDO calculations.