(2E,6E)-8-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-2-benzofuran-5-yl)-2,6-dimethylocta-2,6-dienoyl-CoA + acetyl-CoA = (4E,8E)-10-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-2-benzofuran-5-yl)-3-oxo-4,8-dimethyldeca-4,8-dienoyl-CoA + CoA — reaction