Synonyms: 9,11-Dehydro Ethynyl Estradiol;Ethinyl Estradiol Related Compound B (10 mg) (19-Nor-17alpha-pregna-1,3,5(10),9(11)-tetraen-20-yne-3,17-diol);(17α)-19-Norpregna-1,3,5(10),9(11)-tetraen-20-yne-3,17-diol;19-Nor-17α-pregna-1,3,5(10),9(11)-tetraen-20-yne-3,17-diol;9,11-Dehydro Ethylnyl Estradiol (IMpurity B);Ethinyl Estradiol Related CoMpound B