Blocked cholecalciferol and dihydrotachysterol 3 derivatives
申请人:Merck & Co., Inc.
公开号:US04069321A1
公开(公告)日:1978-01-17
Novel cholecalciferol and dihydrotachysterol.sub.3 derivatives produced against metabolic conversions at the 25-position, their preparation, pharmaceutical compositions, methods of treating steroid-induced osteoporosis, senile osteoporosis and secondary hyperparathyroidism, especially that induced by an insufficient amount of calcium in relationship to the amount of phosphate, novel intermediates and their preparation are disclosed.