英文别名1,3,5(10),6-ESTRATETRAEN-17-ALPHA-ETHYNYL-3,17-BETA-DIOL; (17α)-19-Norpregna-1,3,5(10),6-tetraen-20-yne-3,17-diol; Ethinylestradiol EP Impurity I; DELTA-6-ETHYNYLESTRADIOL; 19-NORPREGNA-1,3,5(10),6-TETRAEN-20-YNE-3,17BETA-DIOL; 3,17BETA-DIHYDROXY-17A-ETHYNYLESTRA-1,3,5(10),6-TETRAENE; 6,7-Dehydro Ethynyl Estradiol; ETHINYLESTRADIOL EP IMPURITY I (6,7-DIDEHYDRO ETHYNYL ESTRADIOL) 
