Clostebol Clinical data Other names Chlorotestosterone; 4-Chlorotestosterone; 4-Chloroandrost-4-en-17β-ol-3-one Drug class Androgen; Anabolic steroid ATC code Legal status Legal status
(8 S,9 S,10 R,13 S,14 S,17 S)-4-Chloro-17-hydroxy-10,13-dimethyl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[ a]phenanthren-3-one CAS Number PubChem CID DrugBank ChemSpider UNII KEGG ChEMBL CompTox Dashboard ( EPA) ECHA InfoCard 100.012.849 Chemical and physical data Formula C 19 H 27 Cl O 2 Molar mass g·mol 322.87 −1 3D model ( JSmol)
(what is this?) (verify) Clostebol ( ; also known as INN 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. 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 reported to be 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.  Chlorodehydromethyltestosterone (Oral Turinabol), combining the chemical structures of clostebol and metandienone, was widely used in the East German state-sponsored doping program.
Clostebol acetate ointment has ophthalmological and dermatological use.
Clostebol, also known as 4-chlorotestosterone or as 4-chloroandrost-4-en-17β-ol-3-one, is a
synthetic androstane steroid and a derivative of testosterone. It is specifically the 4- chlorinated derivative of testosterone.
Society and culture
A related anabolic steroid,
methylclostebol, is a common additive in so-called dietary supplements, generally listed in the convoluted form 4-chloro-17α-methyl-androst-4-en-17β-ol-3-one.
Publicized abuse cases
Use of clostebol has led to the suspension of a number of athletes in various sports including
Freddy Galvis of the Philadelphia Phillies in 2012,  Dee Gordon of the Miami Marlins in 2016, and Olympic athlete  Viktoria Orsi Toth in 2016.
In 2016, urinalysis resulted in
Therese Johaug testing positive for clostebol.  
In the U.S., clostebol is listed as a Schedule III substance.
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