Wikipedia
Cuneane
Cuneane (CH, Pentacyclo[3.3.0.0 .0.0]octane) is a saturated hydrocarbon. Its name is derived from the Latin “cuneus”, meaning a wedge. Cuneane may be produced from cubane by metal-ion-catalyzed σ-bond rearrangement. Similar reactions are known for homocubane (CH) and bishomocubane (CH).
The cuneane molecule has three groups of equivalent carbon atoms (A, B, C), which have also been confirmed by NMR. The molecular graph of the carbon skeleton of cuneane is a regular graph with non-equivalent groups of vertices, and so it is a very important test object for different algorithms of mathematical chemistry.
Some cuneane derivatives have liquid crystal properties.