| 摘要 |
1 alpha -Oxysteroid of the formula <IMAGE> wherein R1 is methyl or ethyl, R2 and R3 each are hydrogen or alkanoyl of 1-8 carbon atoms, and R4 is hydrogen or hydrocarbon of 1-4 carbon atoms, ARE PROGESTESTIONALLY ACTIVE AND USEFUL IN ORAL CONTRACEPTIVE AND MENOPAUSAL COMPOSITIONS. |
