The invention is directed to
17.beta.-nitro-11.beta.-arylsteroids of formula I: ##STR1## wherein
R.sup.1, R.sup.6, R.sup.7, R.sup.12 and X are as defined by the
specification. The compounds exhibit potent antiprogestational
activity and are useful in the treatment of fibroids,
endometriosis, cervical ripening prior to delivery, hormone
replacement therapy and in the control of fertility.