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Clinical data
Trade names Pandocrine; Testopan
Routes of
Synonyms RP-12222; 17α-Methyltestosterone 3-cyclopentyl enol ether
CAS Number
PubChem CID
ECHA InfoCard 100.000.609
Chemical and physical data
Formula C25H38O2
Molar mass 370.58 g·mol−1
3D model (Jmol)

Penmesterol (INN) (brand names Pandrocine, Testopan; former developmental code name RP-12222), or penmestrol, also known as 17α-methyltestosterone 3-cyclopentyl enol ether,[1] is a steroidal androgen and anabolic steroid that was developed in the early 1960s.[2][3][4][5] It is the 3-cyclopentyl enol ether of methyltestosterone.[6][7]

See also[edit]


  1. ^ Martin Negwer; Hans-Georg Scharnow (4 October 2001). Organic-chemical drugs and their synonyms: (an international survey). Wiley-VCH. p. 2653. ISBN 978-3-527-30247-5. 
  2. ^ J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 942–. ISBN 978-1-4757-2085-3. 
  3. ^ Ricardo Azziz (8 November 2007). Androgen Excess Disorders in Women. Springer Science & Business Media. pp. 122–. ISBN 978-1-59745-179-6. 
  4. ^ William Andrew Publishing (22 October 2013). Pharmaceutical Manufacturing Encyclopedia, 3rd Edition. Elsevier. pp. 2935–. ISBN 978-0-8155-1856-3. 
  5. ^ P. H. List; L. Hörhammer (12 March 2013). Chemikalien und Drogen Teil A: N-Q. Springer-Verlag. pp. 504–. ISBN 978-3-642-65035-2. 
  6. ^ Ercoli, Alberto; Gardi, Rinaldo (1960). "Δ4-3-Keto Steroidal Enol Ethers. Paradoxical Dependency of Their Effectiveness on the Administration Route". Journal of the American Chemical Society. 82 (3): 746. doi:10.1021/ja01488a062. 
  7. ^ Camille Georges Wermuth (2 May 2011). The Practice of Medicinal Chemistry. Academic Press. pp. 731–. ISBN 978-0-08-056877-5.