4.2.3.115 geranyl diphosphate - Cananga odorata var. fruticosa alpha-terpinene + diphosphate - ? 418671 4.2.3.115 geranyl diphosphate - Dysphania ambrosioides alpha-terpinene + diphosphate the isomerization-cyclization involves a 1,2-hydride shift in the terpinyl cation to the terpin-4-yl-cation ? 418671