| 摘要 |
Novel 4,5-seco-estrane-3,5,17-trione derivatives of the formula <IMAGE> I wherein R1 is alkyl of 1 to 3 carbon atoms, R2 is selected from the group consisting of hydrogen and alkyl of 1 to 5 carbon atoms and K and K' are individually blocked ketones in the form of ketals which are intermediates for the preparation of therapeutically active steroids and their preparation and novel intermediates. |
