17-alpha-Pregn-4-en-20-yn-3-one, 17-hydroxy-, and 19-nor-17-alpha-pregna-1,3,5(10)-trien-20-yne-3,17-diol (1:1000) 53568-84-6 Amenorone Amenorone forte Ethinylestradiol and ethisterone (1:1000) Ethisterone and ethinylestradiol (1000:1) Pregn-4-en-20-yn-3-one, 17-hydroxy-, (17alpha)-, mixt. with (17alpha)-19-norpregna-1,3,5(10)-trien-20-yne-3,17-diol