label: hexaprenyl diphosphate synthase (geranylgeranyl-diphosphate specific) activity
label_lc: hexaprenyl diphosphate synthase (geranylgeranyl-diphosphate specific) activity
description: "Catalysis of the reaction: geranylgeranyl diphosphate + 2 isopentenyl diphosphate = 2 diphosphate + all-trans-hexaprenyl diphosphate."