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Menthol, also known as hexahydrothymol, is commonly known as L-menthol, and its scientific name is 5-methyl-2-isopropyl-cyclohexanol. It is a very important cycloterpene alcohol. L-menthol has a characteristic mint aroma and has a cooling effect. Racemic ?C menthol also has a cooling effect, while other isomers have no cooling effect. L-menthol accounts for a large proportion of applications in medicine and health. It can be used as poultice, ointment, analgesic, local anesthetic, cooling agent, antipruritic agent, mouthwash, bactericide, and for the treatment of toothache, Tablets for stomach pain, neuralgia, etc.; the second largest use is spices. L-menthol is a spice in demand among cyclic monoterpene alcohols. It can be used as tobacco spices, used with peppermint oil to prepare toothpaste flavors, and other spices. Toilet water; menthol can also be used as a flavoring agent for a variety of foods, such as candies, chewing gum, cakes, fruit wine, refreshing drinks, etc.