Progesterone receptor antagonist

The invention relates to 17-hydroxy-17-pentafluoroethyl-estra-4,9 (10) -diene-11-aryl derivatives of the formula I with progesterone antagonizing effect and to processes for their preparation, their use for the treatment and / or prophylaxis of diseases and their use for the preparation of medicaments for the treatment and / or prophylaxis of diseases, especially uterine fibroids (fibroids, uterine leiomyomata), of endometriosis, of heavy menstrual bleeding, meningiomas, hormone-dependent breast cancer and of conditions associated with post-menopausal complaints or for fertility control and emergency contraception.