4-farnesyl-3,5-dihydroxy-6-methylphthalide + AH2 + 2 O2 = (4E,8E)-10-(4,6-dihydroxy-7-methyl-3-oxo-1,3-dihydro-2-benzofuran-5-yl)-4,8-dimethyldeca-4,8-dienoate + acetone + A + H2O + H(+) — reaction