p-Menthane is a hydrocarbon with the formula (CH<sub>3</sub>)<sub>2</sub>CHC<sub>6</sub>H<sub>10</sub>CH<sub>3</sub>. It is the product of the hydrogenation or hydrogenolysis of various terpenoids, including p-cymene, terpinolenes, phellandrene, and limonene. It is a colorless liquid with a fragrant fennel-like odor. It occurs naturally, especially in exudates of Eucalyptus fruits. The compound is generally encountered as a mixture of the cis and trans isomers, which have very similar properties