What is "hexamethylbenzene"

n. (context organic compound English) An alkyl derivative of benzene in which every hydrogen atom has been replaced by a methyl group

Hexamethylbenzene is a white crystalline solid with chemical formula C(CH). It is an aromatic hydrocarbon with six methyl groups stemming from the carbon centres of the ring. Hexamethylbenzene has historical significance in the field of X-ray crystallography. In 1929, Kathleen Lonsdale first proved the shape of hexamethylbenzene and thus showed that the benzene ring is hexagonal and flat.