Myrcene,2 or β-myrcene, is a natural olefinic organic compound. It is classified as a hydrocarbon, more precisely as a monoterpene. Terpenes are dimers of isoprene, and myrcene is one of the most important. It is a component of the essential oil of several plants, including Laurus nobilis, cannabis,3 ylang-ylang, thyme, parsley,4 and hops.56 It is produced primarily semi-synthetically from myrcia, from which receives its name. It is a key intermediate in the production of various fragrances. α-myrcene is the name for the structural isomer 2-methyl-6-methylene-1,7-octadiene, which is not found in nature and is little used.