Nandrolone acetate, also known as 19-nortestosterone 17ò-acetate or as estr-4-en-17ò-ol-3-one 17ò-acetate, is a synthetic, injected anabolicâÂÂandrogenic steroid (AAS) and a derivative of 19-nortestosterone (nandrolone) that was never marketed. It is an androgen ester â specifically, the C17ò acetate ester of nandrolone.