Clostebol (INN)

Clostebol (INN), also known as 4-chlorotestosterone, usually as the ester clostebol acetate, is a synthetic anabolic androgenic steroid (AAS). Clostebol is the 4-chloro derivative of the natural hormone testosterone. The chlorination prevents conversion to dihydrotestosterone (DHT) while also rendering the chemical incapable of conversion to estrogen.[citation needed] Although usually used as an ester including clostebol acetate (Macrobin, Steranabol, Alfa-Trofodermin, Megagrisevit), clostebol caproate (Macrobin-Depot), or clostebol propionate (Yonchlon), unmodified/non-esterified clostebol is also marketed, under the brand name Trofodermin-S in Mexico.

Clostebol is a weak AAS with potential use as a performance enhancing drug. It is currently banned by the World Anti-Doping Agency. Oral Turinabol, combining the chemical structures of clostebol and dianabol, was widely used in the East German state-sponsored doping program.

Non-doping uses

Clostebol acetate ointment has ophthalmological and dermatological use.

Clostebol

Synonyms: 4-Chloro-17beta-hydroxyandrost-4-en-3-one;Androst-4-en-3-one, 4-chloro-17-hydroxy-, (17beta)-;4-ANDROSTEN-4-CHLORO-17-BETA-OL-3-ONE;4-CHLOROTESTOSTERONE;4-CHLOROTESTOSTERONE ALCOHOL;CLOSTEBOL;Clostebol VETRANAL;ClostebolAcetateBase

CAS: 1093-58-9

MF: C19H27ClO2

MW: 322.87

EINECS: 214-133-9

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Notice: This product is only suitable for laboratory use, or the use of animals. It can not be used directly on the human body