17-alpha-Butadiynyl-17-beta-hydroxyestr-4-en-3-one 17-beta-Hydroxy-17-alpha-butadiynyl-estr-4-en-3-one 2010-49-3 BRN 2164705 ESTR-4-EN-3-ONE, 17-alpha-BUTADIYNYL-17-beta-HYDROXY-