N-(hexanoyl)sphing-4-enine + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) => N-hexanoyl-sphinga-4E,14Z-dienine + 2 Fe(III)-[cytochrome b5] + 2 H2O
n-(hexanoyl)sphing-4-enine + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) => n-hexanoyl-sphinga-4e,14z-dienine + 2 fe(iii)-[cytochrome b5] + 2 h2o
N-(hexanoyl)sphing-4-enine + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) => N-hexanoyl-sphinga-4E,14Z-dienine + 2 Fe(III)-[cytochrome b5] + 2 H2O
n-(hexanoyl)sphing-4-enine + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) => n-hexanoyl-sphinga-4e,14z-dienine + 2 fe(iii)-[cytochrome b5] + 2 h2o