Thujopsene synthase  Thujopsene synthase () is an enzyme with systematic name "(2E,6E)-farnesyl diphosphate lyase (cyclizing, (+)-thujopsene-forming)". This enzyme catalyses the following chemical reaction  The recombinant enzyme from the plant "Arabidopsis thaliana" produces (+)-alpha-barbatene, (+)-thujopsene and (+)-beta-chamigrene.