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Longifolene is an important tricyclic sesquiterpene in heavy turpentine oil, and its mass fraction can reach more than 65%.
Beta-Caryophyllene is another important sesquiterpene. Longifolene is naturally found in heavy turpentine oil and presents in small amounts in other essential oils. It appears pale yellow liquid with a pine-like odor. It is mainly used for the preparation of isolongifolene.