[gqaicazs] Some symmetric branched alkanes

Methane CH4
Ethane C2H6
Neopentane (Dimethylpropane) C5H12
Tetramethylbutane C8H18
Tetraethylmethane (Diethylpentane) C9H20
Tetra-tert-butylmethane (3,3-di-tert-butyl-2,2,4,4-tetramethylpentane) C17H36 (self steric hindrance)
3,3,4,4-tetra-tert-butyl-2,2,5,5-tetramethylhexane (Ethane with 6 tert-butyl groups: hexa-tert-butylethane?) C26H54 (more steric hindrance?)

Ammonium cation NH4+
Hydrogen ion H+
Silane SiH4
Tetramethylsilane Si(CH3)4

Cyclic:
Adamantane
Twistane
Cubane
Dodecahedrane