(Z)-γ-Bisabolene is a sesquiterpenes and is found in Lisbon lemons and the essential oil of Ferula alliacea andÂXylopia aethiopica. (Z)-γ-Bisabolene can be utilized to investigate the fidelity and promiscuity in a terpenoid cyclization reaction of class I terpenoid cyclase epi-isozizaene synthase.