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|Synonyms||17α-Vinyltestosterone; Ethenyltestosterone; 17α-Ethenyltestosterone; 17α-Vinylandrost-4-en-17β-ol-3-one; 17α-Hydroxypregna-4,20-dien-3-one|
|Chemical and physical data|
|Molar mass||314.462 g/mol|
|3D model (JSmol)|
Vinyltestosterone, or 17α-vinyltestosterone, also known as 17α-vinylandrost-4-en-17β-ol-3-one, as well as 17α-hydroxypregna-4,20-dien-3-one, is a synthetic anabolic–androgenic steroid (AAS) that was never marketed. However, two 19-nortestosterone derivatives of vinyltestosterone, norvinisterone (17α-vinyl-19-nortestosterone) and norgesterone (17α-vinyl-δ5(10)-19-nortestosterone), have been marketed. They are used as progestins for female hormonal contraception, rather than as AAS.
Vinyltestosterone is a relatively weak AAS. In one study, it showed approximately one-third and one-fifth of the respective androgenic and anabolic activity of other AAS such as nandrolone (19-nortestosterone), methyltestosterone (17α-methyltestosterone), and ethyltestosterone (17α-ethyltestosterone) in castrated male rats, whereas ethisterone (17α-ethynyltestosterone) showed almost no androgenic and anabolic activity (only 1/20th the anabolic potency of vinyltestosterone). Additionally, in women with metastatic breast cancer, vinyltestosterone was found to be ineffective in treating the disease (unlike other AAS such as testosterone propionate or fluoxymesterone) and produced little or no virilization in the women at a dosage of 100 mg intramuscularly three times per week.
17α-Vinyltestosterone in large doses manifested weak myotropic and androgenic activities in castrated male rats (1) and proved to be ineffective in the therapy of patients with metastatic breast cancer, in whom it had little or no virilizing effect at a dosage level of 100 mg. intramuscularly three times a week (18).
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