1alpha,25-dihydroxy-2beta-(1,3-dihydroxypropoxy)-cholecalciferol = 1alpha,2beta,25-trihydroxycholecalciferol + 3-hydroxypropanal
1alpha,25-dihydroxy-2beta-(1,3-dihydroxypropoxy)-cholecalciferol = 1alpha,2beta,25-trihydroxycholecalciferol + 3-hydroxypropanal