Newcomers on the scene: The modification of endohedral metallofullerenes with an Ih-C80 cage by cyclopropanation-type addition reactions generally yields the [6,6] methanofullerene adducts. Now [5,6]-open methanofullerenes with an Ih-C80-derived cage have been synthesized, as confirmed by X-ray crystallography, under relatively mild, stoichiometric conditions along with the corresponding [6,6]-open derivatives in good yields.