Neoprogestin, vinylnortestosterone, SC-4641|
|Chemical and physical data|
|3D model (Jmol)||
169 to 171 °C (336 to 340 °F) |
Norvinisterone (INN) (marketed as Neoprogestin and Nor-Progestelea by Syntex; former developmental code name SC-4641), also known as 17α-vinyl-19-nortestosterone (or vinylnortestosterone), is a steroidal progestin and androgenic-anabolic steroid (AAS) of the 19-nortestosterone group that is or has been used in Europe. It was synthesized in 1953, and was studied in humans by 1960. It appears to be quite androgenic, with about one-third and one-fifth of the androgenic and anabolic activity, respectively, of nandrolone (19-nortestosterone) in animal bioassays.