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IUPAC name
Other names
Methyltrienolone, R1881
965-93-5 YesY
ChEBI CHEBI:379896 N
ChEMBL ChEMBL166444 YesY
ChemSpider 229099 N
ECHA InfoCard 100.190.113
Jmol 3D model Interactive image
KEGG C14257 N
MeSH D015741
PubChem 261000
Molar mass 284.39266
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Metribolone (INN) (developmental code names R-1881 (or RU-1881), NSC-92858), also known as methyltrienolone (or 17α-methyltrenbolone), as well as 17α-methyl-19-nor-Δ9,11-testosterone or 17α-methyl-19-norandrosta-4,9,11-triene-17β-ol-3-one, is a highly potent, orally active, non-aromatizable anabolic-androgenic steroid (AAS)[1] of the 19-nortestosterone and 17α-alkylated groups which was never marketed for clinical use but has been used in scientific research as a photoaffinity label for the androgen receptor (AR) and in AR ligand binding assays.[2] It is the 17α-methylated derivative of trenbolone (trienolone), and is a similarly potent AAS, but has a high potential for hepatotoxicity similarly to other 17α-alkylated AAS.[3] Metribolone binds with high affinity not only to the AR but also to the progesterone receptor (PR), and binds to the glucocorticoid receptor (GR) as well.[4][5] It is said to be the most potent AAS.[6]

Eleven members of the Greek national weightlifting team and 4 Greek track and field athletes tested positive with methyltrienolone prior to the 2008 Beijing Olympic Games.[7]

See also[edit]


  1. ^ Bojar H, Maar K, Staib W (1980). "The endocrine background of human renal cell carcinoma. V. Binding of the highly potent androgen methyltrienolone (R 1881) by tumour cytosol". Urologia Internationalis. 35 (2): 154–60. doi:10.1159/000280315. PMID 6966435. 
  2. ^ Brinkmann AO, Kuiper GG, de Boer W, Mulder E, Bolt J, van Steenbrugge GJ, van der Molen HJ (January 1986). "Characterization of androgen receptors after photoaffinity labelling with [3H]methyltrienolone (R1881)". Journal of Steroid Biochemistry. 24 (1): 245–9. doi:10.1016/0022-4731(86)90058-0. PMID 2422446. 
  3. ^ Krüskemper HL, Noell G (July 1966). "Liver toxicity of a new anabolic agent: methyltrienolone (17-alpha-methyl-4,9,11-estratriene-17 beta-ol-3-one)". Steroids. 8 (1): 13–24. doi:10.1016/0039-128x(66)90114-0. PMID 5955468. 
  4. ^ Singh SM, Gauthier S, Labrie F (February 2000). "Androgen receptor antagonists (antiandrogens): structure-activity relationships". Current Medicinal Chemistry. 7 (2): 211–47. doi:10.2174/0929867003375371. PMID 10637363. 
  5. ^ Ho-Kim MA, Tremblay RR, Dubé JY (November 1981). "Binding of methyltrienolone to glucocorticoid receptors in rat muscle cytosol". Endocrinology. 109 (5): 1418–23. doi:10.1210/endo-109-5-1418. PMID 6975208. 
  6. ^ Schneider G, Kiss A, Mernyák E, Benke Z, Wölfling J, Frank É, Bózsity N, Gyovai A, Minorics R, Zupkó I (2016). "Stereocontrolled synthesis of the four 16-hydroxymethyl-19-nortestosterone isomers and their antiproliferative activities". Steroids. 105: 113–20. doi:10.1016/j.steroids.2015.12.003. PMID 26686898. 
  7. ^ "Eleven Greek weightlifters test positive; coach suspended". Associated Press / 2008-04-04. Retrieved 2009-06-28. 

External links[edit]