methylstenbolone methylstenbolone methylstenbolone, known by the nicknames m-sten, methyl-sten, and ultradrol, is a synthetic and orally active anabolic–androgenic steroid (aas) and a 17α-methylated derivative of dihydrotestosterone (dht) which was never introduced for medical use. it is a designer steroid and has been sold via the internet marketed as a dietary/nutritional supplement. methylstenboloneclinical dataother namesm-sten; methyl-sten; ultradol; nsc-74234; 2,17α-dimethyl-δ1-4,5α-dihydrotestosterone; 2,17α-dimethyl-δ1-dht; 2,17α-dimethyl-5α-androst-1-en-17β-ol-3-oneroutes ofadministrationby mouthdrug classandrogen; anabolic steroidatc codenonepharmacokinetic databioavailability98%identifiers iupac name (5s,8r,9s,10s,13s,14s,17s)-17-hydroxy-2,10,13,17-tetramethyl-5,6,7,8,9,11,12,14,15,16-decahydro-4h-cyclopentaphenanthren-3-one cas number6176-38-1pubchem cid252380chemspider221137uniise6t9c1ymbchebichebi:79535chemical and physical dataformulac21h32o2molar mass316.485 g·mol−13d model (jsmol)interactive image smiles cc1=c2((cc32cc4(3cc4(c)o)c)cc1=o)c inchi inchi=1s/c21h32o2/c1-13-12-19(2)14(11-18(13)22)5-6-15-16(19)7-9-20(3)17(15)8-10-21(20,4)23/h12,14-17,23h,5-11h2,1-4h3/t14-,15+,16-,17-,19-,20-,21-/m0/s1key:tvtsdurkyarcml-iyrcevngsa-n side effects