4.2.3.136 (2E,6E)-farnesyl diphosphate = (-)-alpha-isocomene + diphosphate - - 4.2.3.136 (2E,6E)-farnesyl diphosphate = (-)-alpha-isocomene + diphosphate reaction proceeds through caryophyllyl and presilphiperfolanyl cations and involves the protonation of a stable (-)-(E)-beta-caryophyllene intermediate 729600