17-alpha-Methylethynyl-19-nortestosterone 17-beta-Hydroxy-17-(1-propynyl)estr-4-en-3-one 21-Methylnorethisterone 7359-79-7 ESTR-4-EN-3-ONE, 17-beta-HYDROXY-17-alpha-(1-PROPYNYL)- Estr-4-en-3-one, 17-beta-hydroxy-17-(1-propynyl)-