4-hydroxy-6-(16-hydroxy-2-oxohexadecyl)pyran-2-one + 3 CO2 + 4 CoA => 15-hydroxypentadecanoyl-CoA + 3 malonyl-CoA + 3 H(+)
4-hydroxy-6-(16-hydroxy-2-oxohexadecyl)pyran-2-one + 3 co2 + 4 coa => 15-hydroxypentadecanoyl-coa + 3 malonyl-coa + 3 h(+)