norvinisterone norvinisterone norvinisterone, sold under the brand names neoprogestin and nor-progestelea, is a progestin and androgen/anabolic steroid (aas) medication which was used in europe but is now no longer marketed. it is taken by mouth. norvinisteroneclinical datatrade namesneoprogestin, nor-progesteleaother namesvinylnortestosterone; sc-4641; 17α-vinyl-19-nortestosterone; 17α-vinylestr-4-en-17β-ol-3-oneroutes ofadministrationby mouthdrug classprogestogen; progestin; androgen; anabolic steroidatc codenoneidentifiers iupac name (8r,9s,10r,13s,14s,17r)-17-ethenyl-17-hydroxy-13-methyl-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopentaphenanthren-3-one cas number6795-60-4pubchem cid65588chemspider59030unii7q843v12q0chemical and physical dataformulac20h28o2molar mass300.442 g·mol−13d model (jsmol)interactive imagemelting point169 to 171 °c (336 to 340 °f) smiles o=c4\c=c2/(1cc3((o)(\c=c)cc31cc2)c)cc4 inchi inchi=1s/c20h28o2/c1-3-20(22)11-9-18-17-6-4-13-12-14(21)5-7-15(13)16(17)8-10-19(18,20)2/h3,12,15-18,22h,1,4-11h2,2h3/t15-,16+,17+,18-,19-,20-/m0/s1key:vojyzdfyehkhap-xgxhktljsa-n norvinisterone is a progestin, or a synthetic progestogen, and hence is an agonist of the progesterone receptor, the biological target of progestogens like progesterone. it has androgenic activity. norvinisterone was synthesized in 1953. it is no longer available. medical uses norvinisterone was used in hormonal contraception to prevent pregnancy. pharmacology pharmacodynamics norvinisterone is a progestogen. it appears to be quite androgenic, with about one-third and one-fifth of the androgenic and anabolic activity, respectively, of nandrolone in animal bioassays. however, it has also been reported to have little anabolic activity. chemistry