(13Z)-docosenoyl-CoA + malonyl-CoA + H(+) => 3-oxo-(15Z)-tetracosenoyl-CoA + CO2 + CoA
(13z)-docosenoyl-coa + malonyl-coa + h(+) => 3-oxo-(15z)-tetracosenoyl-coa + co2 + coa
(13Z)-docosenoyl-CoA + malonyl-CoA + H(+) => 3-oxo-(15Z)-tetracosenoyl-CoA + CO2 + CoA
(13z)-docosenoyl-coa + malonyl-coa + h(+) => 3-oxo-(15z)-tetracosenoyl-coa + co2 + coa