17a-pregn-4-ene-3-oxo-21-carboxylic acid esters of Formula 1,
wherein C1------C2 is a CC single or C=C double bond,
and
R is an alkyl or alkenyl residue of up to 6 carbon atoms,
in addition to antialdosterone activity, exhibit greatly reduced antiandrogenic and progestational side effects.
式 1 的 17a-孕甾-4-烯-3-氧代-21-
羧酸酯、
其中 C1------C2 是 CC 单键或 C=C 双键、
和
R 是最多 6 个碳原子的烷基或烯基残基、
除抗
睾酮活性外,还大大降低了抗雄激素和孕激素的副作用。