Parkeol synthase
Parkeol synthase () is an enzyme with systematic name (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, parkeol-forming). This enzyme catalyses the following chemical reaction

 (3S)-2,3-epoxy-2,3-dihydrosqualene  parkeol

The enzyme from rice (Oryza sativa) produces only parkeol.