tosagestin tosagestin tosagestin (inn, usan) (developmental code name org-30659), also known as 11-methylene-δ15-norethisterone or 17α-ethynyl-11-methylene-19-nor-δ15-testosterone, is a progestin of the 19-nortestosterone group which was under development by organon in the united states and europe as a hormonal contraceptive (in combination with ethinylestradiol) and for the treatment of menopausal symptoms but was never marketed. not to be confused with tocogest or tocogestan. tosagestinclinical dataother namesorg-30659; exogestin; letogestin; 11-methylene-δ15-norethisterone; 17α-ethynyl-11-methylene-19-nor-δ15-testosteroneroutes ofadministrationby mouthidentifiers iupac name (1s,2r,10r,11s,14r,15s)-14-ethynyl-14-hydroxy-15-methyl-17-methylidenetetracycloheptadeca-6,12-dien-5-one cas number110072-15-6pubchem cid159355chemspider140146uniiys7z529o22keggd06197chemblchembl2107658comptox dashboard (epa)dtxsid50891344 chemical and physical dataformulac21h24o2molar mass308.421 g·mol−13d model (jsmol)interactive image smiles cc12cc(=c)c3c(c1c=cc2(c#c)o)ccc4=cc(=o)ccc34 inchi inchi=1s/c21h24o2/c1-4-21(23)10-9-18-17-7-5-14-11-15(22)6-8-16(14)19(17)13(2)12-20(18,21)3/h1,9-11,16-19,23h,2,5-8,12h2,3h3/t16-,17-,18-,19+,20-,21-/m0/s1key:yjstyqgzkjhxln-olgwugkesa-n