Cook, C., Kepler, J., Zhang, P., Lee, Y., & Tallent, C. (2000). 20-keto-11.beta.-arylsteroids and their derivatives having agonist or antagonist hormonal properties. (U.S. Patent No. 6020328). http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=6020328
The invention is directed to 20-keto-11.beta.-arylsteroids of
formula I: ##STR1## wherein R.sup.1, R.sup.6, R.sup.7, R.sup.9,
R.sup.12 and X are as defined by the specification. The compounds
exhibit progestational and antiprogestational activities.
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