Vitamin D derivative modified at 20-position, process for its production, intermediate product for its production, pharmaceutical preparation containing this derivative and its use for the production of pharmaceuticals

摘要

The invention relates to vitamin D derivatives, modified in 20-position, of general formula I IMAGE I in which X, Y, Z, R1, R2 as well as R3 have the meaning indicated in the description, process for their production and their use as agents for treatment of hyperproliferative diseases of the skin.