| 摘要 |
A 3-keto-19-nor-pregnene of the formula <IMAGE> wherein R is selected from the group consisting of hydroxy, acyloxy of an organic carboxylic acid, lower alkoxy, halogen and lower alkyl, R' is selected from the group consisting of hydrogen and halogen, or R and R' together form oxygen, R3 is selected from the group consisting of methyl, -OH and lower acyloxy of an organic carboxylic acid and the dotted line is an optional double bond in the 6,7-position useful for treating the symptoms of menopause in females.
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