norgesterone norgesterone norgesterone, also known as norvinodrel or vinylestrenolone and sold under the brand name vestalin, is a progestin medication which was formerly used in birth control pills for women but is now no longer marketed. it was used in combination with the estrogen ethinylestradiol. it is taken by mouth. norgesteroneclinical datatrade namesvestalin (with ee)other namesnorvinodrel; vinylestrenolone; vinilestrenolone; vinylnoretynodrel; 17α-vinylestr-5(10)-en-17-ol-3-one; 17α-vinyl-δ5(10)-19-nortestosteroneroutes ofadministrationby mouthdrug classprogestogen; progestinatc codenoneidentifiers iupac name (8r,9s,13s,14s,17r)-17-ethenyl-17-hydroxy-13-methyl-1,2,4,6,7,8,9,11,12,14,15,16-dodecahydrocyclopentaphenanthren-3-one cas number13563-60-5pubchem cid65606chemspider59047uniiyfs274763ycomptox dashboard (epa)dtxsid60159482 chemical and physical dataformulac20h28o2molar mass300.442 g·mol−13d model (jsmol)interactive image smiles cc12ccc3c(c1ccc2(c=c)o)ccc4=c3ccc(=o)c4 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/h3,16-18,22h,1,4-12h2,2h3/t16-,17-,18+,19+,20+/m1/s1key:ypvuhobtcwjynq-slhncblasa-n norgesterone 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 no androgenic activity. norgesterone was first described in 1962. it is no longer available. medical uses norgesterone was used in combination with ethinylestradiol in birth control pills to prevent pregnancy. it is no longer available. pharmacology pharmacodynamics norgesterone is a progestogen, and hence is an agonist of the progesterone receptor. unlike related progestins, it is virtually devoid of androgenic activity in animal assays. chemistry