3-oxo-(11Z,14Z,17Z,20Z)-hexacosatetraenoyl-CoA + NADPH + H(+) = (3R)-hydroxy-(11Z,14Z,17Z,20Z)-hexacosatetraenoyl-CoA + NADP(+)
3-oxo-(11z,14z,17z,20z)-hexacosatetraenoyl-coa + nadph + h(+) = (3r)-hydroxy-(11z,14z,17z,20z)-hexacosatetraenoyl-coa + nadp(+)