Clinical data
ATC code None
Synonyms Demethoxyhoggolic acid; NSC-86465; 2-methyl-3-ethyl-4-phenyl-δ4-cyclohexenecarboxylic acid
CAS Number 7698-97-7
PubChem (CID) 24371
ChemSpider 22786
Chemical and physical data
Formula C16H20O2
Molar mass 244.3288 g/mol
3D model (Jmol) Interactive image

Fenestrel (INN, USAN) (developmental code name ORF-3858) is a synthetic, non-steroidal estrogen that was developed as a postcoital contraceptive in the 1960s but was never marketed.[1][2][3] Synthesized by Ortho Pharmaceutical in 1961 and studied extensively, it was coined the "morning-after-pill" or "postcoital antifertility agent".[4] Fenestrel is a seco analogue of doisynolic acid, and a member of the cyclohexenecarboxylic acid series of estrogens.[5][6]

See also


  1. J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 517–. ISBN 978-1-4757-2085-3.
  2. Revaz C, Goldenberg B, Achtari H (1971). "[Critical study of new contraceptive methods]". Schweiz Med Wochenschr (in French). 101 (3): 92–6. PMID 5544232.
  3. Kunjappu MJ (2011). "Pioneering studies of the "morning-after" pill". Yale J Biol Med. 84 (2): 109–11. PMC 3117403Freely accessible. PMID 21698041.
  4. Stanley R. Glasser; David W. Bullock (6 December 2012). Cellular and Molecular Aspects of Implantation. Springer Science & Business Media. pp. 478–. ISBN 978-1-4613-3180-3.
  5. Raymond Eller Kirk; Donald Frederick Othmer (1980). Encyclopedia of chemical technology. Wiley. p. 672. ISBN 978-0-471-02065-3.
  6. Acta europaea fertilitatis. Piccin Medical Books. 1969.

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