Compounds of formula (I): ##STR1## \x9bwherein: R.sup.1 is hydrogen, alkyl, aryl-substituted alkyl or aromatic heterocyclic-substituted alkyl; R.sup.2 is: aryl-substituted alkyl, aromatic heterocyclic-substituted alkyl or diarylamino; and R.sup.3 is carboxy or a group of formula --CONHSO.sub.2 R.sup.4 wherein R.sup.4 is alkyl!; and pharmaceutically acceptable salts and esters thereof have valuable 5.alpha.-reductase inhibitory activity and can thus be used for the treatment and prophylaxis of, inter alia, prostatic hypertrophy as well as other disorders arising from excess levels of 5.alpha.-dihydrotestosterone.
式(I)的化合物:##STR1## 其中:R.sup.1是氢、烷基、芳基取代的烷基或芳香族杂环取代的烷基;R.sup.2是芳基取代的烷基、芳香族杂环取代的烷基或二芳基
氨基;R.sup.3是羧基或式--CONHSO.sub.2 R.sup.4中的基团,其中R.sup.4是烷基!;以及其药学上可接受的盐和酯具有有价值的5α-还原酶抑制活性,因此可用于治疗和预防前列腺肥大等由过量5α-二氢
睾酮水平引起的其他疾病。