[Separation and identification of impurities in Chinese norgestrel].
Fang
X G
XG
Song
Y W
YW
D006067:Gonanes / Q000302:isolation & purification*; D009644:Norgestrel / Q000032:analysis*
D006067:Gonanes; C055308:13-ethyl-gon-4-ene-3,17-dione; D009644:Norgestrel; C055307:13-ethyl-17-hydroxy-gon-4-en-3-one