dodecamethylcyclohexagermane

1,1,2,2,9,9,10,10-octamethyl-1,2,9,10-tetragerma-5,6,13,14-dibenzocyclohexadeca-3,7,11,15-tetrayne

oxygen

decamethylcyclopentagermane

benzylpentamethyldigermane