Androstanedione
Androstanedione, also known as 5α-androstanedione or as 5α-androstane-3,17-dione, is a naturally occurring androstane steroid and an endogenous metabolite of androgens like testosterone, dihydrotestosterone, dehydroepiandrosterone, and androstenedione. It is the C5 epimer of etiocholanedione. Androstanedione is formed from androstenedione by 5α-reductase and from DHT by 17β-hydroxysteroid dehydrogenase. It has some androgenic activity.