17.alpha.-Pregna-2,4-dien-20-yno[2,3-d]isoxazol-17-ol 17230-88-5 Chronogyn Danazol Danocrine Danol NSC270916 Pregna-2,4-dien-20-yno[2,3-d]isoxazol-17-ol, (17.alpha.)- WIN 17,757 Win 17757 Winobanin