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Ball-and-stick model of azacosterol
Clinical data
Synonyms20,25-Diazacholesterol; 20,25-Azacholesterol; Azasterol; Diazasterol; SC-12937; DAC; IMD-760; 17β-(3-(Dimethylamino)propyl)methyl-
Routes of
CAS Number
PubChem CID
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass388.63 g/mol g·mol−1
3D model (JSmol)
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Azacosterol (INN), or azacosterol hydrochloride (USAN) (brand name Ornitrol), also known as 20,25-diazacholesterol, is a cholesterol-lowering drug (hypocholesteremic) which was marketed previously but has since been discontinued.[1][2][3] It is also an avian chemosterilant used to control the pest pigeon population via inducing sterility.[4] The drug is a sterol and derivative of cholesterol in which two carbon atoms have been replaced with nitrogen atoms.[5]

Azacosterol acts as an inhibitor of 24-dehydrocholesterol reductase (24-DHCR), preventing the formation of cholesterol from desmosterol.[4][6] Although it primarily acts to inhibit 24-DHCR, the drug also inhibits other steps in cholesterol biosynthesis.[6] The anti-fertility effects of the drug in birds are mediated by inhibition of steroid hormone production, steroid hormones being synthesized from cholesterol.[4] Due to prevention of the metabolism of desmosterol, the drug causes it to accumulate, in turn producing side effects such as hyperkeratosis, particularly of the palms and soles.[6]

See also[edit]


  1. ^ J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 110–. ISBN 978-1-4757-2085-3.
  2. ^ I.K. Morton; Judith M. Hall (31 October 1999). Concise Dictionary of Pharmacological Agents: Properties and Synonyms. Springer Science & Business Media. pp. 43–. ISBN 978-0-7514-0499-9.
  3. ^ William Andrew Publishing (22 October 2013). Pharmaceutical Manufacturing Encyclopedia, 3rd Edition. Elsevier. pp. 463–. ISBN 978-0-8155-1856-3.
  4. ^ a b c Progress in Medicinal Chemistry. Elsevier. 1 January 1979. pp. 79–. ISBN 978-0-08-086264-4.
  5. ^ Counsell, R. E.; Klimstra, P. D.; Ranney, R. E. (1962). "Hypocholesterolemic Agents. III.1N-Methyl-N-(dialkylamino)alkyl-17β-aminoandrost-5-en-3β-ol Derivatives". Journal of Medicinal and Pharmaceutical Chemistry. 5 (6): 1224. doi:10.1021/jm01241a014. PMID 14056455.
  6. ^ a b c Peter M. Elias (21 January 2016). Advances in Lipid Research: Skin Lipids. Elsevier. pp. 218–220. ISBN 978-1-4832-1545-7.