| 摘要 |
Compounds of formula I or II are provided, wherein R<SUB>1</SUB>-R<SUB>8 </SUB>are defined herein, and pharmaceutical compositions and kits containing these compounds. Also provided are methods of inducing contraception, providing hormone replacement therapy, treating cycle-related symptoms, or treating or preventing benign or malignant neoplastic disease using the compounds of formula I, formula II, or formula III, wherein R<SUB>1</SUB>-R<SUB>9 </SUB>are defined herein:
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