label: an N-acyl-(4R)-4-hydroxysphinganine + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) => a (4R,8E)-4-hydroxysphingenine ceramide + 2 Fe(III)-[cytochrome b5] + 2 H2O
label_lc: an n-acyl-(4r)-4-hydroxysphinganine + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) => a (4r,8e)-4-hydroxysphingenine ceramide + 2 fe(iii)-[cytochrome b5] + 2 h2o