methylclostebol methylclostebol methylclostebol, also known as 4-chloro-17α-methyltestosterone or as 4-chloro-17α-methylandrost-4-en-17β-ol-3-one, is a synthetic, orally active anabolic-androgenic steroid (aas) and designer steroid that has been sold on the internet as a "dietary supplement", but it has never been studied for medical use. it is the 17α-alkylated variant of clostebol (4-chlorotestosterone). methylclostebolclinical dataother nameschloromethyltestosterone; cmt; 4-chloro-17α-methyltestosterone; 4-chloro-17α-methylandrost-4-en-17β-ol-3-oneroutes ofadministrationorallegal statuslegal status us: schedule iii identifiers iupac name (8r,9s,10r,13s,14s,17s)-4-chloro-17-hydroxy-10,13,17-trimethyl-2,6,7,8,9,11,12,14,15,16-decahydro-1h-cyclopentaphenanthren-3-one cas number5785-58-0pubchem cid227107chemspider197559unii0956z23q9nchebichebi:79860chemical and physical dataformulac20h29clo2molar mass336.90 g·mol−13d model (jsmol)interactive image smiles c12ccc(=o)c(=c1cc32cc4(3cc4(c)o)c)cl inchi inchi=1s/c20h29clo2/c1-18-9-8-16(22)17(21)15(18)5-4-12-13(18)6-10-19(2)14(12)7-11-20(19,3)23/h12-14,23h,4-11h2,1-3h3/t12-,13+,14+,18-,19+,20+/m1/s1key:somogwlytlqjgt-xmuhmhrvsa-n rahnema, crosnoe, and kim (2015) reported that german athletes used methylclostebol as a performance enhancing drug in the 1960s and 1970s, but this has not been substantiated. the compound is listed as a banned anabolic agent by the world anti-doping agency.