1,3,5,7-Tetramethyl-1,3,5,7-tetrasilaadamantane
1,3,5,7-Tetramethyl-1,3,5,7-tetrasilaadamantane is the organosilicon compound with the formula . It is a colorless solid that is soluble in organic solvents. The compound is one of the iconic carbosilanes, featuring alternating  linkages. Otherwise it can be described as a diamondoid cluster. It arises as one of many products from the pyrolysis of tetramethylsilane. A more efficient route involves the reaction of the cyclic carbosilane  (1,1,3,3,5,5-hexamethyl-1,3,5-trisilacyclohexane) with aluminium tribromide. References

Adamantane-like molecules
Carbosilanes