3 isopentenyl diphosphate + (2E)-geranyl diphosphate <=> (2E,6E,10E,14E)-geranylfarnesyl diphosphate + 3 diphosphate
3 isopentenyl diphosphate + (2e)-geranyl diphosphate <=> (2e,6e,10e,14e)-geranylfarnesyl diphosphate + 3 diphosphate