clogestone clogestone clogestone (inn, ban), also known as chlormadinol or as 3β,17α-dihydroxy-6-chloropregna-4,6-diene-20-one, is a steroidal progestin that was synthesized in 1964 and was investigated as a progestin-only contraceptive but was never marketed. a diacetate ester, clogestone acetate, also exists and similarly was never marketed. clogestoneclinical dataother nameschlormadinolidentifiers iupac name 1-heptadeca-6,8-dien-14-yl]ethan-1-one cas number20047-75-0pubchem cid20055454chemspider16736893unii0i88k7v2tfcomptox dashboard (epa)dtxsid60173865 chemical and physical dataformulac21h29clo3molar mass364.91 g·mol−13d model (jsmol)interactive image smiles cc(=o)c1(ccc2c1(ccc3c2c=c(c4=cc(ccc34c)o)cl)c)o inchi inchi=1s/c21h29clo3/c1-12(23)21(25)9-6-16-14-11-18(22)17-10-13(24)4-7-19(17,2)15(14)5-8-20(16,21)3/h10-11,13-16,24-25h,4-9h2,1-3h3/t13-,14+,15-,16-,19+,20-,21-/m0/s1key:wztuzrfsdwxdrm-iagojmrcsa-n