2 isopentenyl diphosphate + (2E,6E,10E)-geranylgeranyl diphosphate <=> all-trans-hexaprenyl diphosphate + 2 diphosphate
2 isopentenyl diphosphate + (2e,6e,10e)-geranylgeranyl diphosphate <=> all-trans-hexaprenyl diphosphate + 2 diphosphate