Which molecule is usually comprised of six carbons in a ring (with six sides) ?

The hydrocarbon is usually named using the prefix that would indicate or entail how many carbon are present in it. For six carbons, the name would begin with hexa-. For cyclic molecule, the name would begin further with cyclo-. Thus, for the molecule that is described above, the name would be, cyclohexane.

Another, more well-known, component is the cyclic molecule with alternating double bonds, this will be named, benzene.