Menthol molecule. The three carbon atoms which are centers of asymmetry are starred.
Menthol, also known as 3-hydroxy-p-menthane (C10H19OH), is a terpene alcohol and alicyclic compound. Menthol is a white, waxy crystalline solid with a pungent odor and mint flavor. It has a soothing effect on the throat and nasal passages, and is used in medications, cosmetics, and flavorings. Menthol is extracted from peppermint oil (Mentha arvensis) or synthesized. Commercially, the most important form is l-menthol.