| Section2 = | Section7 = | SPhrases = }} }} Limonene's a hydrocarbon, classified as a cyclic terpene. It's a colourless liquid at room temperatures with an extremely strong smell of oranges. It takes its name from the lemon, as the rind of the lemon, like other citrus fruits, contains considerable amounts of this chemical compound, which's responsible for much of their smell. Limonene's a chiral molecule, and as's common with such forms, biological sources produce one enantiomer: the principal… (More on Limonene)