label: 1alpha,25-dihydroxy-2beta-(3-hydroxypropoxy)-cholecalciferol + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) = 1alpha,25-dihydroxy-2beta-(1,3-dihydroxypropoxy)-cholecalciferol + 2 Fe(III)-[cytochrome b5] + H2O
label_lc: 1alpha,25-dihydroxy-2beta-(3-hydroxypropoxy)-cholecalciferol + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) = 1alpha,25-dihydroxy-2beta-(1,3-dihydroxypropoxy)-cholecalciferol + 2 fe(iii)-[cytochrome b5] + h2o