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IUPAC name
Preferred IUPAC name
Other names
11-Ketotestosterone; 11-Oxotestosterone
  • 53187-98-7 ☒N
3D model (JSmol)
  • InChI=1S/C19H26O3/c1-18-8-7-12(20)9-11(18)3-4-13-14-5-6-16(22)19(14,2)10-15(21)17(13)18/h9,13-14,16-17,22H,3-8,10H2,1-2H3/t13-,14-,16-,17+,18-,19-/m0/s1 checkY
  • InChI=1/C19H26O3/c1-18-8-7-12(20)9-11(18)3-4-13-14-5-6-16(22)19(14,2)10-15(21)17(13)18/h9,13-14,16-17,22H,3-8,10H2,1-2H3/t13-,14-,16-,17+,18-,19-/m0/s1
  • O=C2C[C@]4([C@H]([C@@H]3CC\C1=C\C(=O)CC[C@]1(C)[C@@H]23)CC[C@@H]4O)C
Molar mass 302.40794
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

11-Ketotestosterone (11-KT) is an oxidized form of testosterone that contains a keto group at the C11 position. It is related to adrenosterone, an androgen found in trace quantities in humans. In fish, 11-ketotestosterone functions as the endogenous androgenic sex hormone.[1][2] In midshipman fish, 11-ketotestosterone is not present in females or Type II Males — Type II Males reach sexual maturation later, are less territorial, and have higher testosterone than Type I Males.

In mammals, 11-ketotestosterone has similar potency to testosterone as an androgen, and has been identified as an important adrenal androgen.[3] However, unlike Testosterone, it is very weakly anabolic and mostly prevents muscle breakdown as opposed to promoting muscle growth. It is synthesized from 11β-hydroxyandrostenedione and, to a lesser extent, 11-ketoandrostenedione (adrenosterone).[3] 11-Ketoandrostenedione has notably been sold online as an androgen prohormone, usually under the name 11-oxoandrostenedione (11-OXO).[3]

See also[edit]


  1. ^ Nelson, Randy F. (2005). An introduction to behavioral endocrinology. Sunderland, Mass: Sinauer Associates. p. 143. ISBN 0-87893-617-3.
  2. ^ Nagahama Y, Miura T, Kobayashi T (1994). "The onset of spermatogenesis in fish". Ciba Found. Symp. Novartis Foundation Symposia. 182: 255–67, discussion 267–70. doi:10.1002/9780470514573.ch14. ISBN 9780470514573. PMID 7835154.
  3. ^ a b c Pretorius, Elzette; Arlt, Wiebke; Storbeck, Karl-Heinz (2016). "A new dawn for androgens: Novel lessons from 11-oxygenated C19 steroids" (PDF). Molecular and Cellular Endocrinology. 441: 76–85. doi:10.1016/j.mce.2016.08.014. ISSN 0303-7207. PMID 27519632. S2CID 4079662.