Terpinen-4-ol, a monoterpenoid alcohol, is the key constituent of tea tree (Melaleuca alternifolia) oil.

(-)-trans-Caryophyllene, a sesquiterpene, is the major constituent in the essential oil of Mentha longifolia and Commiphora gileadensis. It shows anti-inflammatory, local anaesthetic and antifungal properties. (-)-trans-Caryophyllene also shows potent cytotoxic activity.

(-)-α-Bisabolol is the major constituent of essential oil from leaves of Hymenocrater yazdianus.

α-Pinene is a monoterpene used in industries like fragrance, pharmaceuticals, flavor, and cosmetics. It is a major component of pine oil and turpentine oil. Isomerization of α-pinene yields industrially important compounds like camphene, limonene, and p-cymene.

(-)-α-Thujone, a monoterpene ketone found in the essential oil of Thuja occidentalis, shows potent antitumorigenic effect.