[A simple method for the introduction of substituents in the 10-beta position of 19-norsteroids].

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@article{Ponsold1969ASM, title={[A simple method for the introduction of substituents in the 10-beta position of 19-norsteroids].}, author={K Ponsold and M Wunderwald and W. Schade}, journal={Tetrahedron letters}, year={1969}, volume={16}, pages={1209-12} }