(+)-ñ-pinene synthase (EC 4.2.3.121, (+)-ñ-pinene cyclase, cyclase I) is an enzyme with systematic name geranyl-diphosphate diphosphate-lyase [cyclizing, (+)-ñ-pinene-forming]. This enzyme catalyses the following chemical reaction
Cyclase I of Salvia officinalis (sage) gives about equal parts (+)-ñ-pinene and (+)-camphene.