Synonyms: (5Z,7E,22E)-9,10-Secoergosta-5,7,10(19),22-tetraene-1alpha,3beta-diol; (5Z,7E,22E)-9,10-Secoergosta-5,7,10(19),22-tetraene-1,3-diol; 1alpha-Hydroxyergocalciferol; 1alpha-Hydroxyvitamin D2; 1alpha-OHD2; 1-alpha-Hydroxyvitamin D2; 1-Hydroxyergocalciferol; TSA 840 CAS Number: 54573-75-0...