| Message: | •Alias: Lentaron; 4-hydroxy-androst-4-ene-17-dione; 4-hydroxy-delta(sub4)-androstenedione
•CAS register number: 566-48-3
•Molecular formula: C19H26O3
•Melting point: 199-202°C
•Assay: 99%
Description:
Formestane (Lentaron) is a type I, steroidal aromatase inhibitor. It is used in the treatment of estrogen-receptor positive breast cancer in post-menopausal women. It is available as an intramuscular depot injection.
Formestane is often used to suppress estrogen production from anabolic steroids or prohormones. It also acts as a prohormone to 4-hydroxytestosterone, an active steroid which displays weak androgenic activity in addition to acting as a mild aromatase inhibitor.
Formestane has poor oral bioavailability and as such is no longer popular as many orally active aromatase inhibitors have been identified.
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