(R)-2-hydroxyoctadecanoate + 2 Fe(III)-[cytochrome b5] + H2O => octadecanoate + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+)
(r)-2-hydroxyoctadecanoate + 2 fe(iii)-[cytochrome b5] + h2o => octadecanoate + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+)