The invention relates to compounds of formula (I) and pharmaceutically acceptable salts thereof (I) wherein R1 to R4 are as defined in the claims. The invention further relates to their use as inhibitors of 17β-HSD1 and in treatment or prevention of steroid hormone dependent dis-eases or disorders, such as steroid hormone dependent dis-eases or disorders requiring the inhibition of the 17β-HSD1 enzyme and/or requiring the lowering of the endogenous estradiol concentration. The present invention also relates to the preparation of the aforementioned compounds and to pharmaceutical compositions comprising as an active ingredient(s) one or more of the aforementioned compounds or pharmaceutically acceptable salts thereof.
                            该发明涉及式(I)的化合物及其药用盐(I),其中R1至R4如权利要求中所定义。该发明还涉及它们作为17β-H
SD1的
抑制剂的用途,以及用于治疗或预防类
固醇激素依赖性疾病或紊乱,如需要抑制17β-H
SD1酶和/或需要降低内源性
雌二醇浓度的类
固醇激素依赖性疾病或紊乱。本发明还涉及上述化合物的制备以及包含上述化合物或其药用盐作为活性成分的药物组合物。