clostebol clostebol 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. 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. clostebolclinical dataother nameschlorotestosterone; 4-chlorotestosterone; 4-chloroandrost-4-en-17β-ol-3-onedrug classandrogen; anabolic steroidatc codenonelegal statuslegal status ca: schedule iv identifiers iupac name (8s,9s,10r,13s,14s,17s)-4-chloro-17-hydroxy-10,13-dimethyl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopentaphenanthren-3-one cas number1093-58-9 ypubchem cid68947drugbankdb01521 ychemspider62171 yuniiz7d4g976shkeggd07731 ychemblchembl2106571 ncomptox dashboard (epa)dtxsid5046192 echa infocard100.012.849 chemical and physical dataformulac19h27clo2molar mass322.87 g·mol−13d model (jsmol)interactive image smiles o=c4c(\cl)=c2/(1cc3((o)cc31cc2)c)(c)cc4 inchi inchi=1s/c19h27clo2/c1-18-10-8-15(21)17(20)14(18)4-3-11-12-5-6-16(22)19(12,2)9-7-13(11)18/h11-13,16,22h,3-10h2,1-2h3/t11-,12-,13-,16-,18+,19-/m0/s1 ykey:kczciyzksllnnh-fbpkjdbxsa-n y ny (what is this?) (verify) 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. medical uses clostebol acetate ointment has ophthalmological and dermatological use. side effects