英文别名6,7-Dehydro Norethindrone; (8R,9S,10R,13S,14S,17R)-17-ethynyl-17-hydroxy-13-methyl-1,2,8,9,10,11,12,14,15,16-decahydrocyclopenta[a]phenanthren-3-one; 6(7)-didehydronorethindrone; 17BETA-HYDROXY-19-NORPREGNA-4,6-DIEN-20-YN-3-ONE; DELTA-6(7)-NORETHINDRONE; (17α)-17-Hydroxy-19-norpregna-4,6-dien-20-yn-3-one; 7α-Ethynyl-17β-hydroxyestra-4,6-dien-3-one; Norethindrone EP Impurity A; 6,7-Didehydronorethisterone 
