abstract |
The invention relates to a steroid derivative which steroidal skeleton is bound at carbon atom 17 to a spiromethylene ring of the formula: ##STR1## wherein R a and R b are independently selected from the group consisting of hydrogen, methyl, and halogen; m is 1 or 2; and the asterisk denotes carbon atom 2 of the spiromethylene ring which is carbon atom 17 (or carbon atom 17α of a homosteroid skeleton) of the steroid. The steroids have progestational or antiprogestational activity. |