label: an N-acyleicosasphing-4-enine + 2 Fe(III)-[cytochrome b5] + 2 H2O => an N-acyleicosasphinganine + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+)
label_lc: an n-acyleicosasphing-4-enine + 2 fe(iii)-[cytochrome b5] + 2 h2o => an n-acyleicosasphinganine + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+)