Method of controlling fertility in males with 20-substitute of steroids

摘要

The invention is a method of controlling fertility in male warm- blooded animals by administering a compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 are individually selected from the group consisting of alkyl of 1 to 12 carbon atoms and aralkyl of 7 to 15 carbon atoms or taken together form a saturated heterocycle of 5 to 6 ring members optionally having a second ring heteroatom selected from the group consisting of sulfur, oxygen and nitrogen, R.sub.3 is an - alkyl of 1 to 8 carbon atoms, n is an integer from 2 to 15, R.sub.4 is alkyl of 1 to 12 carbon atoms, R.sub.5 is selected from the group consisting of hydrogen, alkyl of 1 to 12 carbon atoms and acyl of an organic carboxylic acid of up to 12 carbon atoms and the wavy lines indicate that the 17- and 20- asymmetrical centers are independent of the absolute R and S configurations and their non-toxic, pharmaceutically acceptable acid addition salts.