3-methoxy-19-nor-17-β-pregna-1,3,5(10),20-tetraen-17-ol 、
isobutyronitrile oxide 生成 (5'R)-17β-hydroxy-17α-(3'-isopropylisoxazolin-5'-yl)-3-methoxyestra-1,3,5(10)-triene 、 (5'S)-17β-hydroxy-17α-(3'-isopropylisoxazolin-5'-yl)-3-methoxyestra-1,3,5(10)-triene