ru-56187 ru-56187 ru-56187 is a nonsteroidal antiandrogen which was never marketed. it shows 92% of the affinity of testosterone for the androgen receptor and negligible affinity for other steroid hormone receptors. the medication is a silent antagonist of the androgen receptor. ru-56187 is 3- to 10-fold more potent as an antiandrogen than bicalutamide or nilutamide in animals. both ru-56187 and ru-58841 appear to be prodrugs of cyanonilutamide (ru-56279) in vivo in animals. ru-56187clinical datadrug classnonsteroidal antiandrogenidentifiers iupac name 2-(trifluoromethyl)-4-(3,4,4-trimethyl-5-oxo-2-sulfanylideneimidazolidin-1-yl)benzonitrile cas number143782-25-6pubchem cid132581chemspider117054chemblchembl1099140comptox dashboard (epa)dtxsid90162545 chemical and physical dataformulac14h12f3n3osmolar mass327.33 g·mol−13d model (jsmol)interactive image smiles cc1(c(=o)n(c(=s)n1c)c2=cc(=c(c=c2)c#n)c(f)(f)f)c inchi inchi=1s/c14h12f3n3os/c1-13(2)11(21)20(12(22)19(13)3)9-5-4-8(7-18)10(6-9)14(15,16)17/h4-6h,1-3h3key:hlbuakqnkjteiu-uhfffaoysa-n