5,7-dihydroxy-4,6-dimethylphthalide + (2E,6E)-farnesyl diphosphate = (E,E)-farnesyl-5,7-dihydroxy-4,6-dimethylphthalide + diphosphate + H(+)
5,7-dihydroxy-4,6-dimethylphthalide + (2e,6e)-farnesyl diphosphate = (e,e)-farnesyl-5,7-dihydroxy-4,6-dimethylphthalide + diphosphate + h(+)
5,7-dihydroxy-4,6-dimethylphthalide + (2E,6E)-farnesyl diphosphate = (E,E)-farnesyl-5,7-dihydroxy-4,6-dimethylphthalide + diphosphate + H(+)
5,7-dihydroxy-4,6-dimethylphthalide + (2e,6e)-farnesyl diphosphate = (e,e)-farnesyl-5,7-dihydroxy-4,6-dimethylphthalide + diphosphate + h(+)