Biologically active 19-nor vitamin D analogs substituted at C-2 in the A-ring with an ethylidene or an ethyl group. These compounds have preferential activity on mobilizing calcium from bone and either high or normal intestinal calcium transport activity which allows their in vivo administration for the treatment of metabolic bone diseases where bone loss is a major concern. These compounds are also characterized by high cell differentiation activity.
具有
生物活性的 19-nor
维生素 D 类似物,其 A 环的 C-2 位被亚乙基或乙基取代。这些化合物具有从骨骼中动员
钙的优先活性,以及较高或正常的肠道
钙转运活性,因此可以在体内施用,用于治疗骨质流失是主要问题的代谢性骨病。这些化合物还具有高细胞分化活性的特点。