1-Hydroxyergocalciferol 1-alpha-Hydroxyvitamin D2 125285-48-5 1alpha-Hydroxyergocalciferol 54573-75-0 87649-67-0 9,10-Secoergosta-5,7,10(19),22-tetraene-1,3-diol, (1-alpha,3-beta,5Z,7E,22E)- BRN 4716774 Doxercalciferol Hectorol TSA 840