11β-methyl-19-nortestosterone 11β-methyl-19-nortestosterone 11β-methyl-19-nortestosterone (11β-mnt) is a synthetic and orally active anabolic–androgenic steroid (aas) and a derivative of nandrolone (19-nortestosterone) which was developed by the contraceptive development branch (cdb) of the national institute of child health and human development (nichd) and has not been marketed at this time. 11β-methyl-19-nortestosteroneclinical dataother names11β-mnt; 11β-methylestr-4-en-17β-ol-3-oneroutes ofadministrationby mouthdrug classandrogen; anabolic steroid; progestogenidentifiers iupac name (8r,9s,10r,11s,13s,14s,17s)-17-hydroxy-11,13-dimethyl-2,6,7,8,9,10,11,12,14,15,16,17-dodecahydro-1h-cyclopentaphenanthren-3-one cas number18046-77-0 904901-01-5 (dodecylcarbonate)pubchem cid68648057chemspider52085460unii7hk4m3941fchemical and physical dataformulac19h28o2molar mass288.431 g·mol−13d model (jsmol)interactive image smiles c1c2(c)(o)cc23ccc4=cc(=o)cc413 inchi inchi=1s/c19h28o2/c1-11-10-19(2)16(7-8-17(19)21)15-5-3-12-9-13(20)4-6-14(12)18(11)15/h9,11,14-18,21h,3-8,10h2,1-2h3/t11-,14-,15-,16-,17-,18+,19-/m0/s1key:qcnnharirlyuab-ctpxpinysa-n the c17β dodecylcarbonate ester of 11β-mnt, 11β-methyl-19-nortestosterone 17β-dodecylcarbonate (11β-mntdc) (cdb-4754), is a prodrug of 11β-mnt. along with the closely related aas dimethandrolone (7α,11β-dimethyl-19-nortestosterone; cdb-1321) and its ester prodrug dimethandrolone undecanoate (cdb-4521), 11β-mnt and 11β-mntdc are under investigation as potential male contraceptives and to treat male hypogonadism. side effects