<P> Medrogestone, a synthetic drug with effects similar to progesterone </P> <Li> <P> β - Sitosterol, a plant or phytosterol, with a fully branched hydrocarbon side chain at C - 17 and an hydroxyl group at C - 3 </P> </Li> <P> β - Sitosterol, a plant or phytosterol, with a fully branched hydrocarbon side chain at C - 17 and an hydroxyl group at C - 3 </P> <P> In addition to the ring scissions (cleavages), expansions and contractions (cleavage and reclosing to a larger or smaller rings)--all variations in the carbon - carbon bond framework--steroids can also vary: </P>

A steroid is an example of what type of organic compound