Testosterone acetate propionate, or testosterone 3ò-acetate 17ò-propanoate, also known as 4-androstenediol acetate propionate, as well as androst-4-ene-3ò,17ò-diol 3ò-acetate 17ò-propanoate, is a synthetic anabolic-androgenic steroid and an androgen ester which was never marketed. It is the 3ò-acetate, 17ò-propionate (propanoate) diester of testosterone (androst-4-en-17ò-ol-3-one), or, more accurately, of 4-androstenediol (androst-4-ene-3ò,17ò-diol).