(13Z,16Z,19Z,22Z,25Z)-octacosapentaenoyl-CoA + NADP(+) => (2E,13Z,16Z,19Z,22Z,25Z)-octacosahexaenoyl-CoA + NADPH + H(+)
(13z,16z,19z,22z,25z)-octacosapentaenoyl-coa + nadp(+) => (2e,13z,16z,19z,22z,25z)-octacosahexaenoyl-coa + nadph + h(+)