(23S,25R)-25-Hydroxyvitamin D3 26,23-lactol 25-Hydroxyvitamin D(3) 26,23-lactol 83136-06-5 9,10-Secocholesta-5,7,10(19)-triene-3,25,26-triol, 23,26-epoxy-, (3beta,5Z,7E,23S,25R)- Calcifediol lactol