23-Keto-25-hydroxyvitamin D3 25-Hydroxy-23-oxocholecalciferol 25-Hydroxy-23-oxovitamin D3 83353-84-8 9,10-Secocholesta-5,7,10(19)-trien-23-one, 3,25-dihydroxy-, (3beta,5Z,7E)-