Type 3 17β-hydroxysteroid dehydrogenase (17β-HSD) transforms 4-androstene-3, 17-dione (Δ4-dione) into the androgen testosterone. To produce potent inhibitors of this key steroidogenic enzyme, we performed parallel liquid-phase synthesis of 3β-substituted androsterone (ADT) libraries (AD) in good yields and average high-performance liquid chromatography (HPLC) purities of 92-94%. The first library (A) of 3β-amidomethyl-ADT ...