Terpinolene synthase (EC 4.2.3.113, ag9, PmeTPS2, LaLIMS_RR) is an enzyme with systematic name geranyl-diphosphate diphosphate-lyase (cyclizing, terpinolene-forming). This enzyme catalyses the following chemical reaction geranyl diphosphate terpinolene + diphosphate This enzyme requires Mg2+.