label: N-hexacosanoyl-(4R)-hydroxysphinganine + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) => N-(2-hydroxyhexacosanyl)-(4R)-hydroxysphinganine + 2 Fe(III)-[cytochrome b5] + H2O
label_lc: n-hexacosanoyl-(4r)-hydroxysphinganine + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) => n-(2-hydroxyhexacosanyl)-(4r)-hydroxysphinganine + 2 fe(iii)-[cytochrome b5] + h2o