(2Z,6E)-farnesyl diphosphate + 11 isopentenyl diphosphate = di-trans,undeca-cis-tetradecaprenyl diphosphate + 11 diphosphate
(2z,6e)-farnesyl diphosphate + 11 isopentenyl diphosphate = di-trans,undeca-cis-tetradecaprenyl diphosphate + 11 diphosphate