Definition: Derivatives of ERGOSTEROL formed by ULTRAVIOLET RAYS breaking of the C9-C10 bond. They differ from CHOLECALCIFEROL in having a double bond between C22 and C23 and a methyl group at C24.
deficiency: coordinate ERGOCALCIFEROLS /defic (IM) with VITAMIN D DEFICIENCY (IM)
Other names Vitamin D 2; Calciferols; Ergocalciferol; D2, Vitamin; D 2, Vitamin; Vitamin D2
1 alpha-hydroxyergocalciferol [ 1alpha(OH)2D2,1alpha-OHD2,1alpha-hydroxyvitamin D2,Bone Care brand of 1 alpha-hydroxyergocalciferol,Hectorol,Draxis brand of 1 alpha-hydroxyergocalciferol,doxacalciferol,doxercalciferol ] decrease of bone density caused by prednisolone was prevented by above cpd; decreases number of osteoclast areas in normal rats; RN given refers to (1alpha,3beta,5Z,7E,22E)-isomer