Alpha-bergamotene is a sesquiterpene consisting of a bicyclo[3.1.1]hept-2-ene skeleton substituted at positions 2 and 6 by methyl groups and at position 6 by a 4-methylpent-3-en-1-yl group. It has a role as a volatile oil component and a plant metabolite. It is a sesquiterpene, a polycyclic olefin and a bridged compound.