Tetrahydrogestrinone

Tetrahydrogestrinone
Clinical data
Other namesTHG; The Clear; 17α-Ethyl-18-methyl-δ9,11-19-nortestosterone; 17α-Ethyl-18-methylestra-4,9,11-trien-17β-ol-3-one
Routes of
administration		By mouth, intramuscular injection
Drug classAndrogen; Anabolic steroid; Progestogen
Legal status
Legal status
Identifiers
  • (8S,13S,14S,17S)-13,17-diethyl-17-hydroxy-1,2,6,7,8,14,15,16-octahydrocyclopenta[a]phenanthren-3-one
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
CompTox Dashboard (EPA)
Chemical and physical data
FormulaC21H28O2
Molar mass312.453 g·mol−1
3D model (JSmol)
  • O=C1C=C2C(CC1)=C3C=C[C@@]4(CC)[C@@]([C@]3([H])CC2)([H])CC[C@]4(CC)O
  • InChI=1S/C21H28O2/c1-3-20-11-9-17-16-8-6-15(22)13-14(16)5-7-18(17)19(20)10-12-21(20,23)4-2/h9,11,13,18-19,23H,3-8,10,12H2,1-2H3/t18-,19+,20+,21+/m1/s1 checkY
  • Key:OXHNQTSIKGHVBH-ANULTFPQSA-N checkY
 ☒NcheckY (what is this?)  (verify)

Tetrahydrogestrinone (THG), known by the nickname The Clear, is a synthetic and orally active anabolic–androgenic steroid (AAS) which was never marketed for medical use.[1][2] It was developed by Patrick Arnold and was used by a number of high-profile athletes such as Barry Bonds and Dwain Chambers.

  1. ^ Cite error: The named reference US2006045847 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference si was invoked but never defined (see the help page).