label: 4alpha-hydroxymethylzymosterol + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) => 4alpha-formylzymosterol + 2 Fe(III)-[cytochrome b5] + 2 H2O
label_lc: 4alpha-hydroxymethylzymosterol + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) => 4alpha-formylzymosterol + 2 fe(iii)-[cytochrome b5] + 2 h2o