gonane

Gonane can exist as sixty-four isomers, the most common are known as 5α-gonane and 5β-gonane.

Gonane is a steroid nucleus.

Actually, Lupeol is a triterpenoid, not strictly a sterol; it is not a gonane.

The gonane (steroid nucleus) is the parent 17-carbon tetracyclic hydrocarbon molecule with no alkyl sidechains.

A gonane, the simplest steroid, is composed of seventeen carbon atoms in carbon-carbon bonds forming four fused rings in a three-dimensional shape.