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Other names | Demethoxycarbestrol; NSC-86465; 2-methyl-3-ethyl-4-phenyl-δ4-cyclohexenecarboxylic acid |
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Formula | C16H20O2 |
Molar mass | 244.334 g·mol−1 |
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Fenestrel (INN, USAN) (developmental code name ORF-3858) is a synthetic, nonsteroidal estrogen that was developed as a postcoital contraceptive in the 1960s but was never marketed.[1][2][3][4] Synthesized by Ortho Pharmaceutical in 1961 and studied extensively, it was coined the "morning-after-pill" or "postcoital antifertility agent".[5] Fenestrel is a seco analogue of doisynolic acid, and a member of the cyclohexenecarboxylic acid series of estrogens.[6][7]