The invention relates to an antiprogestin 17-spirofuran-3'-ylidene steroid having the formula CHEM wherein R1 is NR2R3, lower acyl, OH, SH, O-lower alkyl or S(O)n-lower alkyl wherein n is 0-2; R2 and R3 are independently selected from hydrogen and lower alkyl; R4 is hydrogen or lower alkyl; R5 is O, (H,H), (H,OH), (H,O-lower acyl), or NOH; R6 and R7 are both hydrogen, or one is hydrogen and the other lower alkyl; and the twitched line represents an alpha or beta bond. n
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机译：本发明涉及具有式的抗孕激素17-螺呋喃-3'-亚烷基类固醇，其中R 1为NR 2 R 3，低级酰基，OH，SH，O-低级烷基或S（O）n-低级烷基，其中n为0 -2; R2和R3独立地选自氢和低级烷基; R4是氢或低级烷基; R5为O，（H，H），（H，OH），（H，O-低级酰基）或NOH; R 6和R 7均为氢，或一个为氢，另一个为低级烷基;抽搐线表示alpha或beta键。 ñ
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