Terpentetriene synthase (EC 4.2.3.36, Cyc2) is an enzyme with systematic name terpentedienyl-diphosphate diphosphate-lyase (terpentetriene-forming). This enzyme catalyses the following chemical reaction
This enzyme requires Mg<sup>2+</sup> for maximal activity but can use Mn<sup>2+</sup>, Fe<sup>2+</sup> or Co<sup>2+</sup> to a lesser extent.