Turpenes are a class of compounds which have a characteristic  odour and occur abundantly in leaves and fruits of many plants. They contain 10 carbon atoms and have the general formula C₁₀H₁₆
Some common turpenes include menthol, camphor, thymol, citral, geraniol, etc. The chemical structure involves two five carbon isoprene units linked together from head to tail. For this reason they are also called isoprenoids.