6,6-difluoronorethisterone acetate 6,6-difluoronorethisterone acetate 6,6-difluoronorethisterone acetate, also known as 6,6-difluoro-17α-ethynyl-19-nortestosterone 17β-acetate or as 6,6-difluoro-17α-ethynylestr-4-en-17β-ol-3-one 17β-acetate, is a steroidal progestin of the 19-nortestosterone group which was never marketed. in comparison to other steroids, is the c17β acetate ester of 6,6-difluoronorethisterone and the 6,6-difluoro analog of norethisterone acetate. 6,6-difluoronorethisterone acetateclinical dataother names6,6-difluoro-17α-ethynyl-19-nortestosterone 17β-acetate; 6,6-difluoro-17α-ethynylestr-4-en-17β-ol-3-one 17β-acetatedrug classprogestogen; progestogen esteridentifiers iupac name (1s,2r,10r,11s,14s,15s)-14-ethynyl-8,8-difluoro-15-methyl-5-oxotetracycloheptadec-6-en-14-yl acetate cas number27189-18-0chemical and physical dataformulac22h26f2o3molar mass376.444 g·mol−13d model (jsmol)interactive image smiles cc(=o)o1(cc23cc(f)(f)c4=cc(=o)cc43cc12c)c#c inchi inchi=1s/c22h26f2o3/c1-4-21(27-13(2)25)10-8-18-17-12-22(23,24)19-11-14(26)5-6-16(19)15(17)7-9-20(18,21)3/h1,11,15-18h,5-10,12h2,2-3h3/t15-,16-,17-,18+,20?,21-/m1/s1key:bphxpniaoqrmiy-qhgtwegnsa-n