asoprisnil asoprisnil asoprisnil (inn; developmental code name j-867) is a synthetic, steroidal selective progesterone receptor modulator that was under development by schering and tap pharmaceutical products for the treatment of uterine fibroids. in 2005, phase iii clinical trials were discontinued due to endometrial changes in patients. asoprisnilclinical dataatc codenoneidentifiers iupac name (8s,11r,13s,14s,17s)-11-phenyl]-17-methoxy-17-(methoxymethyl)-13-methyl-1,2,6,7,8,11,12,14,15,16-decahydrocyclopentaphenanthren-3-one cas number199396-76-4 npubchem cid9577221iuphar/bps2883chemspider7851660 yunii72w09924wpkeggd02996 ychemblchembl267431 ycomptox dashboard (epa)dtxsid40904033 chemical and physical dataformulac28h35no4molar mass449.591 g·mol−13d model (jsmol)interactive image smiles o=c5\c=c4/c(=c3/(c1ccc(\c=n\o)cc1)c2((cc2(oc)coc)3cc4)c)cc5 inchi inchi=1s/c28h35no4/c1-27-15-24(19-6-4-18(5-7-19)16-29-31)26-22-11-9-21(30)14-20(22)8-10-23(26)25(27)12-13-28(27,33-3)17-32-2/h4-7,14,16,23-25,31h,8-13,15,17h2,1-3h3/b29-16+/t23-,24+,25-,27-,28+/m0/s1 ykey:gjmnafgeujboce-meqiquljsa-n y ny (what is this?) (verify)