dimepregnen dimepregnen dimepregnen (inn, ban) (developmental code name st-1411), or 6α,16α-dimethylpregn-4-en-3β-ol-20-one, is a pregnene steroid described as an antiestrogen that was synthesized in 1968 and was never marketed. it is similar in structure to the progestins and progesterone derivatives melengestrol and anagestone. dimepregnenclinical dataatc codenoneidentifiers iupac name (3β,6α,16α)-3-hydroxy-6,16-dimethylpregn-4-en-20-one cas number21208-26-4pubchem cid208839chemspider180948uniix08n6bot8ychemical and physical dataformulac23h36o2molar mass344.539 g·mol−13d model (jsmol)interactive image smiles cc1cc2c3cc(c4=cc(ccc4(c3ccc2(c1c(=o)c)c)c)o)c inchi inchi=inchi=1s/c23h36o2/c1-13-10-17-18(22(4)8-6-16(25)12-19(13)22)7-9-23(5)20(17)11-14(2)21(23)15(3)24/h12-14,16-18,20-21,25h,6-11h2,1-5h3/t13-,14+,16-,17+,18-,20-,21+,22+,23-/m0/s1key:atejlevejwuxma-xgyzziomsa-n