17-Hydroxy-17-alpha-vinyl-4-estren-3-one 17-Hydroxy-19-nor-17-alpha-pregna-4,20-dien-3-one 17-Vinyl-19-nortestosterone 17beta-Hydroxy-17alpha-vinylestr-4-en-3-one 19-Nor-17-alpha-pregna-4,20-dien-3-one, 17-hydroxy- 19-Nor-17-alpha-vinyltestosterone 6795-60-4 Neoprogestin Nor-progestelea Norvinisterona [INN-Spanish] Norvinisterone Norvinisterone [INN] Norvinisteronum [INN-Latin] SC 4641