英文别名13-Ethyl-3-methoxygona-1,3,5(10)-trien-17-one; 18-Methylestrone methyl ether; (8R,9S,13S,14S)-13-ethyl-3-methoxy-6,7,8,9,11,12,13,14,15,16-decahydro-17H-cyclopenta[a]phenanthren-17-one; Norgestrel Impurity 1; Norgestrel-1; Levonorgestrel Impurity 4 (Ethylmetrienone); Estrone 13-Ethyl 3-Methoxy Impurity 
