(17?)-17-Hydroxy-19-norpregn-5-en-20-yn-3-one; 17-Hydroxy-19-nor-17?-pregn-5-en-20-yn-3-one; Norethisterone Impurity C (EP); Norethindrone EP Impurity C; (Norethindrone Impurity C)
(17?)-17-Hydroxy-19-norpregn-5-en-20-yn-3-one; 17-Hydroxy-19-nor-17?-pregn-5-en-20-yn-3-one; Norethisterone Impurity C (EP); Norethindrone EP Impurity C; (Norethindrone Impurity C)