allylestrenol and its Impurities

Allylestrenol is used in the treatment of recurrent and threatened miscarriage and to prevent premature labor. It is also used in Japan to treat benign prostatic hyperplasia in men. Allylestrenol was first described in 1958 and was introduced for medical use by 1961. Reference standards of Allylestrenol API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.