19-HYDROXY-4-ANDROSTENE-3,17-DIONE
"Androstenedione (chemically known as 4- or 5-androstene-3beta,17beta-dione ) is a steroid hormone that is the precursor to testosterone, the steroid ...
http://www.chemicalland21.com/lifescience/phar/19-HYDROXY-4-ANDROSTENE-3,17-DIONE.htm