cismadinone cismadinone cismadinone (inn), also known as 6α-chloro-17α-hydroxypregna-1,4-diene-3,20-dione or 6α-chloro-δ1-dehydro-17α-hydroxyprogesterone, is a steroidal progestin closely related to the 17α-hydroxyprogesterone derivatives that was never marketed. an acetylated form, cismadinone acetate, also exists, but similarly to cismadinone, was never marketed. not to be confused with chlormadinone acetate. cismadinoneclinical dataother names6α-chloro-1,2-didehydro-17α-hydroxyprogesteroneidentifiers iupac name (1s,2r,8s,10r,11s,14r,15s)-14-acetyl-8-chloro-14-hydroxy-2,15-dimethyltetracycloheptadeca-3,6-dien-5-one cas number54063-31-9pubchem cid193990chemspider168332uniio00xm1o6tvcomptox dashboard (epa)dtxsid10968900 chemical and physical dataformulac21h27clo3molar mass362.89 g·mol−13d model (jsmol)interactive image smiles cc(=o)c1(ccc2c1(ccc3c2cc(c4=cc(=o)c=cc34c)cl)c)o inchi inchi=1s/c21h27clo3/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/h4,7,10,14-16,18,25h,5-6,8-9,11h2,1-3h3/t14-,15+,16+,18+,19-,20+,21+/m1/s1key:rnsisajhbscdgc-scuqkffvsa-n