label: (10Z,13Z,16Z,19Z)-docosatetraenoyl-CoA + malonyl-CoA + H(+) => 3-oxo-(12Z,15Z,18Z,21Z)-tetracosatetraenoyl-CoA + CO2 + CoA
label_lc: (10z,13z,16z,19z)-docosatetraenoyl-coa + malonyl-coa + h(+) => 3-oxo-(12z,15z,18z,21z)-tetracosatetraenoyl-coa + co2 + coa