| 摘要 |
A compound selected from the group consisting of a compound of the formulawherein R1 and R2 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, R3 is an alpha-alkyl of 1 to 8 carbon atoms, n is an integer from 2 to 15, R4 is alkyl of 1 to 12 carbon atoms, R5 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 useful for controlling fertility in male warm-blooded animals.
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