16-Oxo Ethynyl Estradiol;Ethinylesteradiol IMpurity H (16-Oxo- Ethinylesteradiol);16-Oxo-ethinylestradiol;16-Keto-ethynylestradiol;19-Norpregna-1,3,5(10)-trien-20-yn-16-one, 3,17-dihydroxy-, (17α)-;Ethinylestradiol Impurity 8(Ethinylestradiol EP Impurity H);ETHINYLESTERADIOL EP IMPURITY H (16-OXO- ETHINYLESTERADIOL);Ethinylestradiol EP Impurity H