18-methyltestosterone 18-methyltestosterone 18-methyltestosterone (18-mt) is an androgen/anabolic steroid (aas) which was never marketed. along with 19-nortestosterone (nandrolone) and 17α-ethynyltestosterone (ethisterone), it is a parent structure of a number of progestogens and aas. these include the progestogens levonorgestrel (17α-ethynyl-18-methyl-19-nortestosterone) and its derivatives (e.g., desogestrel, gestodene, norgestimate, gestrinone) as well as aas such as norboletone (17α-ethyl-18-methyl-19-nortestosterone) and tetrahydrogestrinone (thg; δ9,11-17α-ethyl-18-methyl-19-nortestosterone). not to be confused with methyltestosterone. 18-methyltestosteroneclinical dataother names18-mt; 18-methylandrost-4-en-17β-ol-3-one; 13β-ethyl-17β-hydroxy-18-norandrost-4-en-3-onedrug classandrogen; anabolic steroididentifiers iupac name (8r,9s,10r,13s,14s,17s)-13-ethyl-17-hydroxy-10-methyl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopentaphenanthren-3-one cas number7381-64-8 ypubchem cid54393203unii8mfh3fap6dchemical and physical dataformulac20h30o2molar mass302.458 g·mol−13d model (jsmol)interactive image smiles cc12cc3(1cc2o)ccc4=cc(=o)cc34c inchi inchi=1s/c20h30o2/c1-3-20-11-9-16-15(17(20)6-7-18(20)22)5-4-13-12-14(21)8-10-19(13,16)2/h12,15-18,22h,3-11h2,1-2h3/t15-,16+,17+,18+,19+,20+/m1/s1key:vidbkwviqcryhg-hlxurnfrsa-n