Clostebol propionate

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Clostebol propionate
Clostebol propionate.svg
Clostebol propionate molecule ball.png
Clinical data
Trade namesYonchlon
Routes of
Intramuscular injection
  • [(8R,9S,10R,13S,14S,17S)-4-Chloro-10,13-dimethyl-3-oxo-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl] propanoate
CAS Number
PubChem CID
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass378.94 g·mol−1
3D model (JSmol)
  • CCC(=O)O[C@H]1CC[C@@H]2[C@@]1(CC[C@H]3[C@H]2CCC4=C(C(=O)CC[C@]34C)Cl)C
  • InChI=1S/C22H31ClO3/c1-4-19(25)26-18-8-7-14-13-5-6-16-20(23)17(24)10-12-21(16,2)15(13)9-11-22(14,18)3/h13-15,18H,4-12H2,1-3H3/t13-,14-,15-,18-,21+,22-/m0/s1

Clostebol propionate (brand name Yonchlon), also known as 4-chlorotestosterone 17β-propionate or as 4-chloroandrost-4-en-17β-ol-3-one 17β-propionate, is a synthetic, injected anabolic-androgenic steroid (AAS) and a derivative of testosterone.[1][2] It is an androgen ester – specifically, the C17β propionate ester of clostebol (4-chlorotestosterone) – and acts as a prodrug of clostebol in the body.[1][additional citation(s) needed] Clostebol acetate is administered via intramuscular injection.[2]

See also[edit]


  1. ^ a b Elks J (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 305–. ISBN 978-1-4757-2085-3.
  2. ^ a b Morton IK, Hall JM (31 October 1999). Concise Dictionary of Pharmacological Agents: Properties and Synonyms. Springer Science & Business Media. pp. 80–. ISBN 978-0-7514-0499-9.