(20S) -2-methylene-19-nor-22-dimethyl-1alpha, 25-dihydroxyvitamin D3 and (20R) -2-methylene-19-nor-22-dimethyl-1alpha, 25-hydroxyvitamin D3

摘要

A compound having the formula I: ** Formula ** where X1 and X2 are independently selected from H and hydroxyl protecting groups, and X3 is H.