(6Z,9Z,12Z,15Z,18Z,21Z)-tetracosahexaenoyl-CoA + O2 => (2E,6Z,9Z,12Z,15Z,18Z,21Z)-tetracosaheptaenoyl-CoA + H2O2
(6z,9z,12z,15z,18z,21z)-tetracosahexaenoyl-coa + o2 => (2e,6z,9z,12z,15z,18z,21z)-tetracosaheptaenoyl-coa + h2o2