RU-2309, also known as 18-methylmetribolone, δ9,11-17α,18-dimethyl-19-nortestosterone, or 17α,18-dimethylestr-4,9,11-trien-17β-ol-3-one, is a 17α-alkylated androgen/anabolic steroid (AAS) of the 19-nortestosterone group which was never marketed.[1][2][3] It is the C18 methyl or C13β ethyl derivative of metribolone.[1][2] The compound is closely related to tetrahydrogestrinone (THG), which has the same chemical structure as RU-2309 except for possessing an ethyl group at the C17α position instead of a methyl group.[4] Hence, it could also be referred to as 17α-methyl-THG.[4] RU-2309 shows high affinity for the androgen, progesterone, and glucocorticoid receptors.[1][2][3]

Clinical data
Other names18-Methylmetribolone; 17α-Methyltetrahydrogestrinone; 17α-Methyl-THG; ∆9,11-17α,18-dimethyl-19-nortestosterone; 17α,18-Dimethylestr-4,9,11-trien-17β-ol-3-one
Drug classAndrogen; Anabolic steroid
PubChem CID
Chemical and physical data
Molar mass298.426 g·mol−1
3D model (JSmol)

See alsoEdit


  1. ^ a b c Delettré J, Mornon JP, Lepicard G, Ojasoo T, Raynaud JP (January 1980). "Steroid flexibility and receptor specificity". J. Steroid Biochem. 13 (1): 45–59. doi:10.1016/0022-4731(80)90112-0. PMID 7382482.
  2. ^ a b c Ojasoo T, Raynaud JP (November 1978). "Unique steroid congeners for receptor studies". Cancer Res. 38 (11 Pt 2): 4186–98. PMID 359134.
  3. ^ a b Loughney DA, Schwender CF (December 1992). "A comparison of progestin and androgen receptor binding using the CoMFA technique". J. Comput. Aided Mol. Des. 6 (6): 569–81. doi:10.1007/bf00126215. PMID 1291626. S2CID 22004130.
  4. ^ a b U. s. Government Printing Office (29 May 2012). Food and Drugs, Part 1300 to End. Government Printing Office. pp. 6–. ISBN 978-0-16-090721-0.