Synthesis of two 6-s-cis locked stereoisomeric analogues of the steroid hormone 1α,25-dihydroxyvitamin D3: 1 α,25-dihydroxy-19-nor-previtamin D3 and 1β,25-dihydroxy- 19-nor-previtamin D3

1. Díaz, M.
2. Ferrero, M.
3. Fernández, S.
4. Gotor, V.